Originally built for 2kg Overture spools but could be adapted to any size spool by making a new cross beam.

This roller requires the following extra parts:

8 x 625ZZ bearings
4 x M5x16 socket head cap screw (length is kinda iffy, I had to grind mine down to clear the spool but the next smaller screw that I had on hand was too short)
4 x M5x30 screws – serve as the axles.

Note: This is very much a prototype, I've used it for a few prints now and already have a list of things to fix when I get a chance.