HomeBrandsPrusaFDM 3D Printers12301
P
12301
Moderate
Prusa · FDM 3D Printers
X-Axis Homing Failed - Stallguard Did Not Trigger
Quick Answer
Error code 12301 on your Prusa FDM 3D Printers means: X-Axis Homing Failed - Stallguard Did Not Trigger. This is usually fixable — see the step-by-step guide below.
Likely Causes
  1. X-axis belt too loose causing stepper to skip rather than stall at the endstop
  2. X-axis linear bearings are too tight creating inconsistent resistance
  3. Stallguard sensitivity threshold needs adjustment in firmware
  4. X motor wiring issue preventing proper current sensing
  5. Print remnant or debris on the X-axis rail blocking movement
How to Fix It
1
Manually move the X carriage along its full travel and feel for binding or rough spots
2
Check X-axis belt tension using the built-in belt test: LCD > Support > Belt Test
3
Clean the smooth rods or linear rails and apply fresh lubrication
4
Verify the X motor cable is securely connected at both the motor and mainboard ends
5
On MK4/MK4S, check that the X-axis tensioner screw is properly adjusted
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
GT2 belt for X-axis
Super Lube or Prusa-recommended lubricant for linear bearings
Replacement LM8UU bearings (MK3S+) or linear rails (MK4)
Related Error Codes
1220112202122031221112212
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