Quick Change Universal Spool Holder with ribs

Remix of https://www.thingiverse.com/thing:1241566

I added 8 ribs for better holding of the two 608zz bearings.
The holes I resized to gross 22.7mm in diameter but with 8 0.3mm ribs it is approx. 22.1mm. This design make the bearings fit each print.

2018-09-03 Added a bolt stl with 75mm thread length (standard: 63 mm), request dragsterbox