Universal Spool Holder for M8 Threaded Rods and 608 Bearings

**Edit 2018-07-20: I had the issue, that the filament gets loose while printing due to the low friction of the bearings. A made a new design that uses axial bearings to prevent that: https://www.thingiverse.com/thing:3012614
The axial bearings work way better for me. So i wouldn't recommend this design anymore.**


I really like the design by rowokii, but i thought there was room for improvements. That's why i made this.

**My changes:**
- added a cutout for a second bearing at the top
-