diff --git a/Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h b/Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h
index 3fafc96d..2dc9f02f 100644
--- a/Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK2-RAMBo10a-E3Dv6full.h
@@ -18,6 +18,9 @@ GENERAL SETTINGS
 // Electronics
 #define MOTHERBOARD BOARD_RAMBO_MINI_1_0
 
+// Prusa Single extruder multiple material suport
+//#define SNMM
+
 // Uncomment the below for the E3D PT100 temperature sensor (with or without PT100 Amplifier)
 //#define E3D_PT100_EXTRUDER_WITH_AMP
 //#define E3D_PT100_EXTRUDER_NO_AMP
@@ -30,7 +33,12 @@ AXIS SETTINGS
 *------------------------------------*/
 
 // Steps per unit {X,Y,Z,E}
+#ifdef SNMM
+#define DEFAULT_AXIS_STEPS_PER_UNIT   {100,100,3200/8,140}
+#else
 #define DEFAULT_AXIS_STEPS_PER_UNIT   {100,100,3200/8,161.3}
+#endif
+
 
 // Endstop inverting
 const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
@@ -120,13 +128,12 @@ EXTRUDER SETTINGS
 
 #ifdef SNMM
 //#define BOWDEN_LENGTH	408
-#define BOWDEN_LENGTH 457 //total length for filament fast loading part; max length for extrusion is 465 mm!
+#define BOWDEN_LENGTH 433 //default total length for filament fast loading part; max length for extrusion is 465 mm!; this length can be adjusted in service menu
 #define FIL_LOAD_LENGTH 102 //length for loading filament into the nozzle
-#define FIL_RETURN_LENGTH 30.5 //for filament adjusting (PRUSAY code)
+#define FIL_COOLING 10 //length for cooling moves
 #define E_MOTOR_LOW_CURRENT 350 // current for PRUSAY code
 #define E_MOTOR_HIGH_CURRENT 700 //current for unloading filament, stop print, PRUSAY ramming
-
-#endif
+#endif //SNMM
 
 //#define DIS //for measuring bed heigth and PINDa detection heigth relative to auto home point, experimental function
 
@@ -364,9 +371,6 @@ THERMISTORS SETTINGS
 #define MAX_E_STEPS_PER_UNIT 250
 #define MIN_E_STEPS_PER_UNIT 100
 
-#define PRINT_STARTED 0xFE
-#define PRINT_FINISHED 0xFF
-
 #define Z_BABYSTEP_MIN -3999
 #define Z_BABYSTEP_MAX 0
 
diff --git a/Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h b/Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h
index 29c6b005..d4529a70 100644
--- a/Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h
+++ b/Firmware/variants/1_75mm_MK2-RAMBo13a-E3Dv6full.h
@@ -18,6 +18,9 @@ GENERAL SETTINGS
 // Electronics
 #define MOTHERBOARD BOARD_RAMBO_MINI_1_3
 
+// Prusa Single extruder multiple material suport
+//#define SNMM
+
 // Uncomment the below for the E3D PT100 temperature sensor (with or without PT100 Amplifier)
 //#define E3D_PT100_EXTRUDER_WITH_AMP
 //#define E3D_PT100_EXTRUDER_NO_AMP
@@ -30,7 +33,12 @@ AXIS SETTINGS
 *------------------------------------*/
 
 // Steps per unit {X,Y,Z,E}
+#ifdef SNMM
+#define DEFAULT_AXIS_STEPS_PER_UNIT   {100,100,3200/8,140}
+#else
 #define DEFAULT_AXIS_STEPS_PER_UNIT   {100,100,3200/8,161.3}
+#endif
+
 
 // Endstop inverting
 const bool X_MIN_ENDSTOP_INVERTING = false; // set to true to invert the logic of the endstop.
@@ -118,18 +126,16 @@ EXTRUDER SETTINGS
 
 
 
-// Prusa Single extruder multiple material suport
-//#define SNMM
+
 
 #ifdef SNMM
 //#define BOWDEN_LENGTH	408
-#define BOWDEN_LENGTH 457 //total length for filament fast loading part; max length for extrusion is 465 mm!
+#define BOWDEN_LENGTH 433 //default total length for filament fast loading part; max length for extrusion is 465 mm!; this length can be adjusted in service menu
 #define FIL_LOAD_LENGTH 102 //length for loading filament into the nozzle
-#define FIL_RETURN_LENGTH 30.5 //for filament adjusting (PRUSAY code)
+#define FIL_COOLING 10 //length for cooling moves
 #define E_MOTOR_LOW_CURRENT 350 // current for PRUSAY code
 #define E_MOTOR_HIGH_CURRENT 700 //current for unloading filament, stop print, PRUSAY ramming
-
-#endif
+#endif //SNMM
 
 //#define DIS //for measuring bed heigth and PINDa detection heigth relative to auto home point, experimental function
 
@@ -367,9 +373,6 @@ THERMISTORS SETTINGS
 #define MAX_E_STEPS_PER_UNIT 250
 #define MIN_E_STEPS_PER_UNIT 100
 
-#define PRINT_STARTED 0xFE
-#define PRINT_FINISHED 0xFF
-
 #define Z_BABYSTEP_MIN -3999
 #define Z_BABYSTEP_MAX 0