Private on-device repair evidence

Hotend Heatsink Fan Not Spinning

Stop long prints until the heatsink fan is restored; clean the fan, check its connector and voltage, confirm firmware control, and replace a noisy or stalled un.

Not started0 of 8 stepsNot yet saved

Visual repair reference for hotend heatsink fan not spinning — A small representative test no longer shows the original symptom.

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.

Controlled tests logged0

Verification resultNot recorded

Machine and material context

Record the setup that produced this result

Printer Extruder Material Slicer Nozzle / layer

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Optional visual proof

Add before and after photos for this report

Before repairChoose a photo After proof testChoose a photo

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One variable at a time

Controlled test history

No controlled tests have been logged yet. Return to Workshop Mode and record each change before running another test.

Repair sequence

Step completion

1
Allow the hotend to cool and disconnect power.Not completed
2
Remove visible debris without damaging the blades.Not completed
3
Spin the fan gently and check for roughness or contact.Not completed
4
Inspect the connector and cable through toolhead movement.Not completed
5
Confirm the fan voltage, size, airflow direction, and connector match the printer.Not completed
6
Use printer diagnostics to test the fan output if supported.Not completed
7
Replace a fan that stalls, grinds, or starts intermittently.Not completed
8
Verify stable hotend temperature and a long retraction test after repair.Not completed

Private workshop notes

Observations and winning values

No notes recorded.

Verification test

Model: Small representative test print
Setup: Use the same printer, material, slicer and key settings as the failed model.
Pass: The original symptom is absent and the target feature is repeatable.
If unchanged: The symptom remains in the same location or stage.

Matched next step

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Hotend Heatsink Fan Not Spinning

Verification test

Keep the winning setup and change only one variable in the next test.

Keep the useful workflow going.