Con lăn thay thế cho ray Kenlin Rite-trak II (Alternate Roller)

Print two copies with the large face on the print bed, slip a piece of filament through the axle and secure it with your favorite method.

Personally, I ran the holes through with a 5/64ths drill bit (#50 works better if you have one). Then I applied a small dab of thick CA on the inner face where the holes are before threading a piece of filament through two, pressing them until the glue cured, then and flush cut it off and moved on to the next one.

I've also in the past secured things like this with a dab of molten plastic from a 3D pen.

You can print this with as thick of layers as you want, and whatever nozzle you want, it doesn't matter; most of mine were done at 0.35mm layers with a 0.6mm nozzle… 3 walls, 20% gyroid infill in PLA.