12302
Moderate
Prusa · FDM 3D Printers
Y-Axis Homing Failed - Stallguard Did Not Trigger
Quick Answer
Error code 12302 on your Prusa FDM 3D Printers means: Y-Axis Homing Failed - Stallguard Did Not Trigger. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Run belt tension test from LCD > Support > Belt Test to check Y belt tension value
2
Verify the heated bed cable harness has full freedom of movement without snagging
3
Clean Y-axis smooth rods and re-lubricate linear bearings
4
Check the Y motor pulley set screw (usually requires disassembly to access)
5
Manually move the bed and check for any obstructions under the frame
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 Y-axis
Linear bearing lubricant
Replacement Y motor pulley with set screws
Related Error Codes