17201
Moderate
Prusa · FDM 3D Printers
MMU Communication Error - Multi Material Unit Not Responding
Quick Answer
Error code 17201 on your Prusa FDM 3D Printers means: MMU Communication Error - Multi Material Unit Not Responding. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Power off both the printer and MMU, then reconnect the communication cable at both ends
2
Verify both the printer and MMU are running the latest compatible firmware versions from prusa.io
3
Check the MMU status LED indicators for error patterns
4
Try a different communication cable if available
5
Reset the MMU by holding its reset button for 5 seconds while powered on
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
Replacement MMU communication cable
Replacement MMU control board (if hardware fault confirmed)
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