Simplest Spool Holder

The original spool holder is not good enough. Therefore, I would like to design a spool holder that is easy to print, easy to assemble, and easy to use.

Nore:
1) A spool holder need 2 Bases and 3 Rollers.
2) 4 ball bearings are required-outer diameter 16 mm, inner diameter 8 mm, width 6mm.