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-rw-r--r--klippy/extras/temperature_mcu.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/klippy/extras/temperature_mcu.py b/klippy/extras/temperature_mcu.py
index 1d05e75b..cb095d88 100644
--- a/klippy/extras/temperature_mcu.py
+++ b/klippy/extras/temperature_mcu.py
@@ -108,7 +108,7 @@ class PrinterTemperatureMCU:
def config_samd51(self):
self.config_samd21(addr=0x00800100)
def config_stm32f1(self):
- self.slope = 3.3 / .004300
+ self.slope = 3.3 / -.004300
self.base_temperature = self.calc_base(25., 1.43 / 3.3)
def config_stm32f2(self):
self.slope = 3.3 / .002500