This Model consists of several parts, that fit on one bed and get glued together. The spool holder runs with the smooth 3d-printed gear-bearings from Prusa, you have to print four of them. Additionally, i lubed the bearings with the same lube i use on the printer-axes and it works perfect. I think you can find the stl of the bearing on the Prusa website

This is a reliable spool holder, which i use for a time now. 

You need Glue and one M3x10 Countersunk screw.