Ender 3 Filament Roller Guide
thingiverse
make a pin (cut a piece of 1.75mm filament to secure the pin) to replace the M4 bolt. also use the 608 bearing from https://www.thingiverse.com/thing:3002837 08/19/23 add a V1.2 for low mount filament. (https://www.thingiverse.com/thing:2948891)
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