filament guide for bearing - Ultimaker 2
thingiverse
I wanted to print TPU with my Ultimaker 2, so I swapped out my feeder for this one: https://www.youmagine.com/designs/alternative-um2-feeder-version-two. My filament kept slipping off the bearing and wasn't getting pushed into the extruder anymore. To solve this problem, I printed a small slippage adapter (add-on) that keeps the filament in line. This design is specifically meant for use with flex-filament only. So far, it's working great! The main thing you'll need to do is adjust the Robert-feeder slightly.
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