ams-jam Troubleshooting

AMS filament jam on the Prusa MK4

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

The AMS (automatic material system) reports a filament jam, stopping the print.

How to fix AMS filament jam

Clear the AMS jam

Open the AMS, untangle the filament, and reload it correctly.

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

Difficulty: ★★ Est. 10 min

Check the AMS sensors

Inspect the AMS filament sensors for debris and clean them.

Source: Reddit r/3Dprinting — troubleshooting Confidence: 60% Verified Aug 9, 2026

Difficulty: ★★ Est. 10 min

Replacement parts for the Prusa MK4

Prusa MK4 Nozzle Prusa MK4 Hardened Steel Nozzle Prusa MK4 PLA Filament Prusa MK4 Build Plate Prusa MK4 Hotend Assembly Prusa MK4 Magnetic Bed Sheet Prusa MK4 PTFE Tube Prusa MK4 Nozzle Set

← All Prusa MK4 error codes

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