Filament Spool Hub with Print In Place Bearings

Hubs to hold your spool in typical 8mm spool holders with print-in-place roller bearings.

Update 1/23/18:
Apparently the spools are not as standard as I thought. Got a new one from 3D Mars and the hole was bigger. Use the original hubs for spools up to around 54mm and the large version for ones up to 57mm