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P
17302
Moderate
Prusa · FDM 3D Printers
MMU Tool Change Failed - Material Switch Did Not Complete
Quick Answer
Error code 17302 on your Prusa FDM 3D Printers means: MMU Tool Change Failed - Material Switch Did Not Complete. This is usually fixable — see the step-by-step guide below.
Likely Causes
  1. Previous filament did not fully retract from the hotend during the tool change
  2. Filament tip forming a blob that cannot pass back through the PTFE path
  3. Cooling move settings in PrusaSlicer are not optimal for the material being used
  4. Hotend temperature too low for the current material, causing high retraction force
How to Fix It
1
Manually unload the stuck filament by heating the hotend and pulling gently
2
Inspect the filament tip after unloading for excessive blobbing or stringing
3
Adjust the ramming and cooling settings in PrusaSlicer for the specific material
4
Increase the unloading temperature by 5-10C if the filament is difficult to retract
5
Clean the hotend interior by performing a cold pull with cleaning filament
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
Cleaning filament (nylon-based)
Replacement nozzle (if clogged beyond cleaning)
PTFE tube segment
Related Error Codes
1220112202122031221112212
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