Dialing In ACE Pro Filament Tension to Prevent Feed Failures

The ACE Pro hub feeds up to 4 filaments. When tension is wrong you get grinding, slipping, or mid-print jams. Here's how to get it dialed.

Symptoms of Wrong Tension

• Too loose: Filament slips, under-extrusion, fails to load
• Too tight: Grinding noise, filament dust at feeder, motor skipping
• Inconsistent: Color swaps miss, purge tower has gaps

Setting Tension Correctly

1. Open the ACE Pro hub — lift the top cover
2. Each channel has a tension arm/lever. Find the adjustment screw.
3. Start loose — back off the screw until you can pull filament through with light resistance
4. Load filament through that channel all the way to the extruder
5. Perform a manual extrude of 50mm at 30mm/s
6. Watch for: smooth pull, no slipping sounds, consistent extrusion
7. Tighten one quarter turn at a time until you feel solid grip
8. Test with a 100mm extrude — it should be smooth with no grinding

Testing All 4 Channels

Run an extrude test on each channel individually:

• 100mm @ 30mm/s — should complete smoothly
• No grinding, no skipping motor sounds
• No filament dust at the hub entry point

Common Fixes

Maintenance Tips

• Wipe filament entry points monthly with dry cloth
• If grinding occurred, check for debris in the gear teeth
• Brittle filament (old PLA) breaks inside the path — use fresh spools
• PETG and TPU need slightly looser tension than PLA