Universal Filament Spool Holder - uses 608z bearings and an 8mm shaft.
A few remarks:
- It may seem that the "triangles" are flimsy (let me know if they are) but they were designed to not consume too much material (my previous iteration was using 8mm walls and 10mm thickness and took forever to print),
- With longer shaft, more cones and washers between the bearings one could have multiple spools installed.
- Works even better with 8mm threaded rod and some nuts!
On my bed I had to split into 2 prints - one for the "triangles" and another for the cones.