Spool roller with snap in bearings

Remixed this as it was the best (in my eyes) design I could find - I wanted a one piece spool holder that could hold 608 bearings without any other pieces of hardware. The original is a great design. My remix was intended to remove some more material from the middle and sides for faster printing and also to resize the spool holder.

This version will hold the 1 KG Inland brand PLA spools that Microcenter sells as well as the small $5 spools of MG Chemicals filament that you can find at Fry's.