Spool Holder with Grooved Rollers

A while back I accidentally ordered some grooved rubber wheels. They sat in a box until I needed to make a spool holder. I figured the grooved rollers might work well for this purpose. I added a screw hole for mounting on a board or rail.
PARTS:
4 grooved rubber rollers with bearings
4 M5 x 30-35mm machine screw
4 M5 nuts (opt. lock nuts)
4-8 spacers. Optional, not shown in photos.

I printed mine on nice stringy PETG, but any material should be fine, other than flexible, of course.