From 2142e1dae493502adb1a26c9f81c2e6d43b0e02a Mon Sep 17 00:00:00 2001
From: woisy00 <spam@bergermeier.info>
Date: Wed, 27 Oct 2021 01:05:34 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20AUTOTEMP=20bug=20(thermal?=
=?UTF-8?q?=20runaway)=20(#23025)?=
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Regression from 9823a37
---
Marlin/Configuration_adv.h | 2 +-
Marlin/src/module/planner.cpp | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 3e1bd2cce6..3d98aac6ca 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -414,7 +414,7 @@
*/
#define AUTOTEMP
#if ENABLED(AUTOTEMP)
- #define AUTOTEMP_OLDWEIGHT 0.98
+ #define AUTOTEMP_OLDWEIGHT 0.98 // Factor used to weight previous readings (0.0 < value < 1.0)
// Turn on AUTOTEMP on M104/M109 by default using proportions set here
//#define AUTOTEMP_PROPORTIONAL
#if ENABLED(AUTOTEMP_PROPORTIONAL)
diff --git a/Marlin/src/module/planner.cpp b/Marlin/src/module/planner.cpp
index b89a313f2b..2552efc69a 100644
--- a/Marlin/src/module/planner.cpp
+++ b/Marlin/src/module/planner.cpp
@@ -1457,7 +1457,7 @@ void Planner::check_axes_activity() {
float t = autotemp_min + high * autotemp_factor;
LIMIT(t, autotemp_min, autotemp_max);
- if (t < oldt) t *= (1.0f - (AUTOTEMP_OLDWEIGHT)) + oldt * (AUTOTEMP_OLDWEIGHT);
+ if (t < oldt) t = t * (1.0f - (AUTOTEMP_OLDWEIGHT)) + oldt * (AUTOTEMP_OLDWEIGHT);
oldt = t;
thermalManager.setTargetHotend(t, active_extruder);
}