PolyBox Filament Roller

I was having issues with weak cardboard filament spools rolling smoothly on the 8mm rods in my new PolyBox 2.

I tried resizing several existing roller designs, but none fit properly. I decided it was time to learn a little “Fusion 360”. (Fairly steep learning curve for a novice.)

Here is an 18 mm shaft that reduces roll resistance. I would have liked a larger diameter, but that would require cutting the PolyBox dividers. 

You may want to use a brim, glue stick, or both when printing the roller because it has a small contact area with the build plate.

If your slicer has ‘modifier’ capabilities (I use PrusaSlicer), you may want to drop a 7.8 by 10mm cylinder using an infill modifier into the pin axle to strengthen it.

Assembly: Just push the axle pins all the way  into the roller, press the original bearings on flush with the axle end, and drop it in.