Fan upgrade issues

The optional fan upgrade (available for A1 Mini, A1, P1P, P1S, X1C) accelerates bed cooling so ejects fire sooner between prints. If it’s not activating, there are two things to check: the app setting and the toolhead microswitch.

Symptoms

• Fan doesn’t spin up after a print completes
• There’s a visible 5 mm gap between the toolhead and the top of the printer
• Ejects fire but cooling takes as long as before the upgrade

Fix 1: enable the Fan Upgrade option in the app

The biggest gotcha: installing the fan hardware isn’t enough, you also have to tell the app about it.

1. Open app.3d-farmers.com (requires FarmLoop Pro)
2. Go to Device settings for the printer you just upgraded
3. Find Fan Upgrade and switch it to On
4. Save, the setting persists across prints

Fix 2: toolhead must reach the top microswitch

After a print, the toolhead needs to travel all the way to the top of the Z axis to trigger the microswitch that powers the fan. If it stops short, the switch never closes.

• Watch the print end sequence. The head should lift up and make contact at the very top.
• If it doesn’t reach, re-run the Calibration routine from the FarmLoop app: Device → Calibration → Lift test.
• A persistent 5 mm gap between the head and the top means the Z-lift value needs adjusting. Nudge it up in the app’s lift calibration until the microswitch clicks audibly on every print end.

Fix 3: fan wiring

If the app setting is on and the microswitch is triggering but the fan still doesn’t spin:

• Unplug the printer (power off fully, not just sleep)
• Open the back of the printer and verify the 4-pin fan connector is firmly seated in one of the two rear ports
• Make sure the cable isn’t pinched where it exits the FarmLoop module
• Reconnect and power-cycle

”Do I need the fan upgrade?”

Honest answer: only if you’re printing back-to-back constantly. For single-print or 2-3-print workflows, bed cooldown isn’t the bottleneck. The upgrade mostly pays off for queues of 5+ prints where shaving 30-60 seconds per eject compounds.

• A1 Mini / A1: the fan upgrade is especially effective because these printers have no built-in enclosure fan
• P1P: similar, no built-in chamber fan, so the upgrade helps a lot
• P1S / X1C: the built-in aux fan already helps; the FarmLoop fan is additive but less dramatic
• P2S: fan upgrade not currently offered

Still not working?

Send us:

1. Photo of the fan installation inside the printer
2. Printer model
3. Video of the print-end sequence showing the toolhead position

contact@3d-farmers.com.