CR-10 V3 spool holder

I always had the Problem that the spool would not roll perfectly smooth on the original spool holder, which resulted in layer inconsistencies. With this spool holder everything runs as smooth as butter. 

The spool holder needs 2 to 4 ball bearings (outer-Ø 22 mm, inner-Ø 8 mm and a width of 7mm). These are pretty standard bearings.

Print recommendations:
- 0.2 mm layerheight
- 15 % infill
- I would print the parts lengthwise and not upright so they do not break easily.

The holder is designed for 1 kg Filament rolls.  

If you find anything that could be improved on this design let me know.