I designed this extremely stable spool holder for the CR-10 for 3 reasons:
to releaf stress on the extruder
to fit all sizes of filament spools
to get rid of all those left over 608 bearings from fidget spinner projects
Update (08/13/2017) : (V7)
I had an issue with one kind of spool, so I decided to make a stability update. There is a rail that connects the two parts of the spool holder. They freely glide on that rail to adjust to any spool size. No more flipping over during filament change. Now it works really flawless. I hope you enjoy it as much as I do.
Update (07/24/2017): Moved the bearings further apart (V4) - This version was not printed by me so far. So please comment and let me know, if you like this better. The further apart bearings cause the spool to sink in a little deeper, which should even incrase stability some more.
After finishing the print - just use four 608 bearings
Add 4 608 bearings