diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index 551364c9bd..0fffc08e5a 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 2997b3ef6d..db4c5f0fe5 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -1724,28 +1724,6 @@ static void clean_up_after_endstop_or_probe_move() {
refresh_cmd_timeout();
}
-#if HAS_BED_PROBE
- /**
- * Raise Z to a minimum height to make room for a probe to move
- */
- inline void do_probe_raise(const float z_raise) {
- #if ENABLED(DEBUG_LEVELING_FEATURE)
- if (DEBUGGING(LEVELING)) {
- SERIAL_ECHOPAIR("do_probe_raise(", z_raise);
- SERIAL_CHAR(')');
- SERIAL_EOL();
- }
- #endif
-
- float z_dest = z_raise;
- if (zprobe_zoffset < 0) z_dest -= zprobe_zoffset;
-
- if (z_dest > current_position[Z_AXIS])
- do_blocking_move_to_z(z_dest);
- }
-
-#endif // HAS_BED_PROBE
-
#if HAS_AXIS_UNHOMED_ERR
bool axis_unhomed_error(const bool x/*=true*/, const bool y/*=true*/, const bool z/*=true*/) {
@@ -2064,6 +2042,27 @@ static void clean_up_after_endstop_or_probe_move() {
#endif // BLTOUCH
+ /**
+ * Raise Z to a minimum height to make room for a probe to move
+ */
+ inline void do_probe_raise(const float z_raise) {
+ #if ENABLED(DEBUG_LEVELING_FEATURE)
+ if (DEBUGGING(LEVELING)) {
+ SERIAL_ECHOPAIR("do_probe_raise(", z_raise);
+ SERIAL_CHAR(')');
+ SERIAL_EOL();
+ }
+ #endif
+
+ float z_dest = z_raise;
+ if (zprobe_zoffset < 0) z_dest -= zprobe_zoffset;
+
+ NOMORE(z_dest, Z_MAX_POS);
+
+ if (z_dest > current_position[Z_AXIS])
+ do_blocking_move_to_z(z_dest);
+ }
+
// returns false for ok and true for failure
bool set_probe_deployed(const bool deploy) {
@@ -2078,13 +2077,21 @@ static void clean_up_after_endstop_or_probe_move() {
// Make room for probe to deploy (or stow)
// Fix-mounted probe should only raise for deploy
- if (
- #if ENABLED(FIX_MOUNTED_PROBE)
- deploy
- #else
- true
- #endif
- ) do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
+ #if ENABLED(FIX_MOUNTED_PROBE)
+ const bool deploy_stow_condition = deploy;
+ #else
+ constexpr bool deploy_stow_condition = true;
+ #endif
+
+ // For beds that fall when Z is powered off only raise for trusted Z
+ #if ENABLED(UNKNOWN_Z_NO_RAISE)
+ const bool unknown_condition = axis_known_position[Z_AXIS];
+ #else
+ constexpr float unknown_condition = true;
+ #endif
+
+ if (deploy_stow_condition && unknown_condition)
+ do_probe_raise(max(Z_CLEARANCE_BETWEEN_PROBES, Z_CLEARANCE_DEPLOY_PROBE));
#if ENABLED(Z_PROBE_SLED) || ENABLED(Z_PROBE_ALLEN_KEY)
#if ENABLED(Z_PROBE_SLED)
@@ -3989,9 +3996,15 @@ inline void gcode_G28(const bool always_home_all) {
#endif
- if (home_all || homeX || homeY) {
+ #if ENABLED(UNKNOWN_Z_NO_RAISE)
+ const float z_homing_height = axis_known_position[Z_AXIS] ? Z_HOMING_HEIGHT : 0;
+ #else
+ constexpr float z_homing_height = Z_HOMING_HEIGHT;
+ #endif
+
+ if (z_homing_height && (home_all || homeX || homeY)) {
// Raise Z before homing any other axes and z is not already high enough (never lower z)
- destination[Z_AXIS] = Z_HOMING_HEIGHT;
+ destination[Z_AXIS] = z_homing_height;
if (destination[Z_AXIS] > current_position[Z_AXIS]) {
#if ENABLED(DEBUG_LEVELING_FEATURE)
diff --git a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
index 5440999a3d..4d24de9c18 100644
--- a/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/AlephObjects/TAZ4/Configuration.h
@@ -802,6 +802,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/AliExpress/CL-260/Configuration.h b/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
index 876b33b9b2..2f9f4be260 100644
--- a/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
+++ b/Marlin/example_configurations/AliExpress/CL-260/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Anet/A6/Configuration.h b/Marlin/example_configurations/Anet/A6/Configuration.h
index 86ab627b98..eb93b617f1 100644
--- a/Marlin/example_configurations/Anet/A6/Configuration.h
+++ b/Marlin/example_configurations/Anet/A6/Configuration.h
@@ -857,6 +857,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Anet/A8/Configuration.h b/Marlin/example_configurations/Anet/A8/Configuration.h
index b96e9ee549..0271b89db2 100644
--- a/Marlin/example_configurations/Anet/A8/Configuration.h
+++ b/Marlin/example_configurations/Anet/A8/Configuration.h
@@ -789,6 +789,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h b/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
index 7d1b91cd79..60a624c9cb 100644
--- a/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
+++ b/Marlin/example_configurations/BIBO/TouchX/Cyclops/Configuration.h
@@ -782,6 +782,8 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 10 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h b/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
index 3617acc04e..3c5e976556 100644
--- a/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
+++ b/Marlin/example_configurations/BIBO/TouchX/default/Configuration.h
@@ -782,6 +782,8 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 10 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/BQ/Hephestos/Configuration.h b/Marlin/example_configurations/BQ/Hephestos/Configuration.h
index 911c17da6d..84cd8e8672 100644
--- a/Marlin/example_configurations/BQ/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/BQ/Hephestos/Configuration.h
@@ -770,6 +770,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h b/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
index 63d14e2b86..3c8167dcb8 100644
--- a/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/BQ/Hephestos_2/Configuration.h
@@ -783,6 +783,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 5 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/BQ/WITBOX/Configuration.h b/Marlin/example_configurations/BQ/WITBOX/Configuration.h
index 22a712e48c..623e1c841f 100644
--- a/Marlin/example_configurations/BQ/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/BQ/WITBOX/Configuration.h
@@ -770,6 +770,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Cartesio/Configuration.h b/Marlin/example_configurations/Cartesio/Configuration.h
index 3bd64c91b6..728c4e37e5 100644
--- a/Marlin/example_configurations/Cartesio/Configuration.h
+++ b/Marlin/example_configurations/Cartesio/Configuration.h
@@ -781,6 +781,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Creality/CR-10/Configuration.h b/Marlin/example_configurations/Creality/CR-10/Configuration.h
index ef9c3406f9..f24f8f1cc8 100755
--- a/Marlin/example_configurations/Creality/CR-10/Configuration.h
+++ b/Marlin/example_configurations/Creality/CR-10/Configuration.h
@@ -792,6 +792,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 5 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Creality/CR-10S/Configuration.h b/Marlin/example_configurations/Creality/CR-10S/Configuration.h
index 3e4cce9cd2..a955a02359 100644
--- a/Marlin/example_configurations/Creality/CR-10S/Configuration.h
+++ b/Marlin/example_configurations/Creality/CR-10S/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Creality/CR-10mini/Configuration.h b/Marlin/example_configurations/Creality/CR-10mini/Configuration.h
index fe418177bd..4d814b7764 100644
--- a/Marlin/example_configurations/Creality/CR-10mini/Configuration.h
+++ b/Marlin/example_configurations/Creality/CR-10mini/Configuration.h
@@ -801,6 +801,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 5 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Creality/Ender-2/Configuration.h b/Marlin/example_configurations/Creality/Ender-2/Configuration.h
index 9d9a6f54ff..d1db0c747b 100644
--- a/Marlin/example_configurations/Creality/Ender-2/Configuration.h
+++ b/Marlin/example_configurations/Creality/Ender-2/Configuration.h
@@ -786,6 +786,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Creality/Ender-4/Configuration.h b/Marlin/example_configurations/Creality/Ender-4/Configuration.h
index 1f583f4074..3bfc8be7bd 100644
--- a/Marlin/example_configurations/Creality/Ender-4/Configuration.h
+++ b/Marlin/example_configurations/Creality/Ender-4/Configuration.h
@@ -792,6 +792,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index 27c6cbed16..1ce29eec7b 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -764,6 +764,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Felix/DUAL/Configuration.h b/Marlin/example_configurations/Felix/DUAL/Configuration.h
index db6413ed88..eaaa467065 100644
--- a/Marlin/example_configurations/Felix/DUAL/Configuration.h
+++ b/Marlin/example_configurations/Felix/DUAL/Configuration.h
@@ -764,6 +764,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h b/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
index fbe1cb111f..552a692d01 100644
--- a/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
+++ b/Marlin/example_configurations/FolgerTech/i3-2020/Configuration.h
@@ -788,6 +788,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 2 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Geeetech/GT2560/Configuration.h b/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
index b64fdb18d7..bc57d0ae2f 100644
--- a/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/GT2560/Configuration.h
@@ -797,6 +797,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h b/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
index 371a7c8b44..7548493f38 100644
--- a/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/I3_Pro_X-GT2560/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 8 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h
index d5f741324a..0bdd9d6275 100644
--- a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/bltouch/Configuration.h
@@ -798,6 +798,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h
index 9f756b4e80..ddc1fc173c 100644
--- a/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h
+++ b/Marlin/example_configurations/Geeetech/Prusa i3 Pro B/noprobe/Configuration.h
@@ -797,6 +797,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Infitary/i3-M508/Configuration.h b/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
index ff102da8e1..c460f08f86 100644
--- a/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
+++ b/Marlin/example_configurations/Infitary/i3-M508/Configuration.h
@@ -786,6 +786,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/JGAurora/A5/Configuration.h b/Marlin/example_configurations/JGAurora/A5/Configuration.h
index 5ecfa41280..68081bc38e 100644
--- a/Marlin/example_configurations/JGAurora/A5/Configuration.h
+++ b/Marlin/example_configurations/JGAurora/A5/Configuration.h
@@ -794,6 +794,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Malyan/M150/Configuration.h b/Marlin/example_configurations/Malyan/M150/Configuration.h
index 931db5872a..23881ea7fe 100644
--- a/Marlin/example_configurations/Malyan/M150/Configuration.h
+++ b/Marlin/example_configurations/Malyan/M150/Configuration.h
@@ -806,6 +806,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Micromake/C1/basic/Configuration.h b/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
index 0329cd60e4..df1bef3e5c 100644
--- a/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
+++ b/Marlin/example_configurations/Micromake/C1/basic/Configuration.h
@@ -786,6 +786,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h b/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
index 1b2837652d..5b535271ba 100644
--- a/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
+++ b/Marlin/example_configurations/Micromake/C1/enhanced/Configuration.h
@@ -786,6 +786,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 3c40c8e505..2e81555a40 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index be6300d2fd..5c331436c3 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -780,6 +780,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index 3930af0892..3ee74ea9a5 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -793,6 +793,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Sanguinololu/Configuration.h b/Marlin/example_configurations/Sanguinololu/Configuration.h
index 7ed3186d22..3b37a3b2f5 100644
--- a/Marlin/example_configurations/Sanguinololu/Configuration.h
+++ b/Marlin/example_configurations/Sanguinololu/Configuration.h
@@ -813,6 +813,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration.h b/Marlin/example_configurations/TinyBoy2/Configuration.h
index b90e587e5f..037c0a6ce7 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration.h
@@ -833,6 +833,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Tronxy/X1/Configuration.h b/Marlin/example_configurations/Tronxy/X1/Configuration.h
index 7aa4b434e4..1e140bde6f 100644
--- a/Marlin/example_configurations/Tronxy/X1/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/X1/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Tronxy/X5S/Configuration.h b/Marlin/example_configurations/Tronxy/X5S/Configuration.h
index f37371a9be..f2b92d27e6 100644
--- a/Marlin/example_configurations/Tronxy/X5S/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/X5S/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 10 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Tronxy/XY100/Configuration.h b/Marlin/example_configurations/Tronxy/XY100/Configuration.h
index b8103c4209..1f914b2b3d 100644
--- a/Marlin/example_configurations/Tronxy/XY100/Configuration.h
+++ b/Marlin/example_configurations/Tronxy/XY100/Configuration.h
@@ -793,6 +793,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Velleman/K8200/Configuration.h b/Marlin/example_configurations/Velleman/K8200/Configuration.h
index 8c5c80a062..45fa0d0b47 100644
--- a/Marlin/example_configurations/Velleman/K8200/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8200/Configuration.h
@@ -811,6 +811,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
// K8200: it is usual to have clamps for the glass plate on the heatbed
#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Velleman/K8400/Configuration.h b/Marlin/example_configurations/Velleman/K8400/Configuration.h
index 5f9c8bbaef..3489546a5b 100644
--- a/Marlin/example_configurations/Velleman/K8400/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8400/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h b/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
index f67ef5e2f1..9cc2dce48f 100644
--- a/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
+++ b/Marlin/example_configurations/Velleman/K8400/Dual-head/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h b/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h
index 9698d106e7..5c6359a4e3 100644
--- a/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h
+++ b/Marlin/example_configurations/Wanhao/Duplicator 6/Configuration.h
@@ -792,6 +792,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index 8439abda85..c85852c371 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -782,6 +782,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
index c2c7e50c36..f576fa4b4f 100644
--- a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration.h
@@ -912,6 +912,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 15 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h b/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
index d4ca85a555..b6de20e4f5 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel/Configuration.h
@@ -912,6 +912,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 15 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
index acb65d3fda..afd62edf56 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration.h
@@ -912,6 +912,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 15 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/Hatchbox_Alpha/Configuration.h b/Marlin/example_configurations/delta/Hatchbox_Alpha/Configuration.h
index 58d45995c9..9be4765dcc 100644
--- a/Marlin/example_configurations/delta/Hatchbox_Alpha/Configuration.h
+++ b/Marlin/example_configurations/delta/Hatchbox_Alpha/Configuration.h
@@ -914,6 +914,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index e48b77b21f..1877a2b17d 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -899,6 +899,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index 74c8f964f2..eefc9ba269 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -902,6 +902,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 15 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index 7be5e2447f..8c93c39f9c 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -902,6 +902,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index fd7ef80d04..940d91ee9b 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -911,6 +911,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
index ced5bcfe87..76f1492afc 100644
--- a/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
+++ b/Marlin/example_configurations/gCreate/gMax1.5+/Configuration.h
@@ -795,6 +795,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
#define Z_HOMING_HEIGHT 10 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index d5b9d5f31f..bd2518e224 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -785,6 +785,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index ecd315f0c0..52e0d8f352 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -777,6 +777,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.
diff --git a/Marlin/example_configurations/wt150/Configuration.h b/Marlin/example_configurations/wt150/Configuration.h
index f04effe260..09cf3b0de9 100644
--- a/Marlin/example_configurations/wt150/Configuration.h
+++ b/Marlin/example_configurations/wt150/Configuration.h
@@ -787,6 +787,8 @@
//#define NO_MOTION_BEFORE_HOMING // Inhibit movement until all axes have been homed
+//#define UNKNOWN_Z_NO_RAISE // Don't raise Z (lower the bed) if Z is "unknown." For beds that fall when Z is powered off.
+
//#define Z_HOMING_HEIGHT 4 // (in mm) Minimal z height before homing (G28) for Z clearance above the bed, clamps, ...
// Be sure you have this distance over your Z_MAX_POS in case.