nozzle-clog Troubleshooting

Nozzle clogged on the Prusa MK4

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

The nozzle is blocked and filament stops extruding, causing under-extrusion or a failed print.

How to fix Nozzle clogged

Cold-pull the nozzle

Heat the nozzle to 200C, push filament through, then pull it out cold to clear the clog.

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

Difficulty: ★★ Est. 10 min

Replace the nozzle

If the clog persists, replace the nozzle with a genuine spare.

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

Difficulty: ★★ Est. 15 min

Parts needed: Prusa MK4 Nozzle, Prusa MK4 Hardened Steel Nozzle, Prusa MK4 Nozzle Set

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

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