Trace the complete feed path, remove spool resistance and broken filament, inspect drive rollers and PTFE connections, then test one slot and one filament at a.
Start hereTrace the complete feed path, remove spool resistance and broken filament, inspect drive rollers and PTFE connections, then test one slot and one filament at a time.
First safe actionRun the first safe check and change one variable at a time.
Proof targetA small representative test no longer shows the original symptom.
Match the failed area to the visual before changing a setting.
Repair progress0 of 8 complete
Step 1 of 8
Remove the active spool and check it unwinds freely.
Keep the problem and target visual open while you make this change.
Why this matters
The feeder cannot pull filament smoothly.
Setting or checkLoad / unload speed
Use the system default until the path is mechanically reliable.
Expected result
The original symptom no longer appears during a representative calibration or short test print.
Step 2 of 8
Cut a clean filament tip and inspect for brittleness, swelling, or excessive curvature.
Keep the problem and target visual open while you make this change.
Why this matters
A fragment blocks the tube or selector.
Setting or checkPurge volume
Does not solve feed resistance.
Expected result
Measurements, temperatures, motion, feed, or exposure remain stable through the complete test.
Step 3 of 8
Disconnect the path in stages to locate the exact resistance point.
Keep the problem and target visual open while you make this change.
Why this matters
Friction rises at a joint.
Setting or checkRetraction at tool change
Use the multi-material system profile.
Expected result
No new warning, collision, leak, electrical smell, unusual heat, or material damage appears.
Step 4 of 8
Remove broken pieces from tubes, hubs, buffers, selectors, and extruder entry.
Keep the problem and target visual open while you make this change.
Why this matters
The drive slips under load.
Setting or checkLoad / unload speed
Use the system default until the path is mechanically reliable.
Expected result
The successful change is recorded with printer, material, slicer, nozzle or resin, and date.
Step 5 of 8
Clean feeder rollers and confirm PTFE tubes are fully seated.
Keep the problem and target visual open while you make this change.
Why this matters
Diameter, softness, cardboard dust, or spool geometry causes trouble.
Setting or checkPurge volume
Does not solve feed resistance.
Expected result
The original symptom no longer appears during a representative calibration or short test print.
Step 6 of 8
Test the same filament in another slot and a known-good filament in the failing slot.
Keep the problem and target visual open while you make this change.
Why this matters
The feeder cannot pull filament smoothly.
Setting or checkRetraction at tool change
Use the multi-material system profile.
Expected result
Measurements, temperatures, motion, feed, or exposure remain stable through the complete test.
Step 7 of 8
Use approved spool adapters or support for incompatible spools.
Keep the problem and target visual open while you make this change.
Why this matters
A fragment blocks the tube or selector.
Setting or checkLoad / unload speed
Use the system default until the path is mechanically reliable.
Expected result
No new warning, collision, leak, electrical smell, unusual heat, or material damage appears.
Step 8 of 8
Complete several load, purge, and unload cycles before a long multicolour print.
Keep the problem and target visual open while you make this change.
Why this matters
Friction rises at a joint.
Setting or checkPurge volume
Does not solve feed resistance.
Expected result
The successful change is recorded with printer, material, slicer, nozzle or resin, and date.
Controlled test log
Change one variable, then record what happened
This keeps temperature, retraction, speed, mechanical, and material tests from blending together. The history stays private in this browser.
Multi-MaterialMMU Load or Unload Failure
Multi-MaterialColour Contamination Between Multi-Colour Filaments
Multi-MaterialPurge Tower Falling Over or Failing
