I ran in to some issues with the more abrasive filaments as well as lower quality spools with higher variance in diameter. I created these rollers to use the existing setup, but provide a bit less resistance on the extruder's stepper motor and gears.
I designed this in OpenSCAD, so if anyone has a bearing with different dimensions you'd like to have a roller for, let me know the dimensions in the comments and I'll throw another post out there.
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