Spool Roller [608 Bearings]

I needed a basic spool roller - this design works fine for placement on a flat surface and standard 1kg spools. Four 608 bearings and two of each part is all you need. The roller part doesn't spin, so it doesn't matter if you use a boatload of supports or whatever, so long as the bearings slide on. There is some clearance for expansion provided in the model. The arms have a flat side and an inboard with bearing race reliefs and can be printed flat.