Planetary Spool Holder and collars

Here is my spool holder for 52mm centred spools and an 8mm shaft.
The openscad files can be edited to change the sizes.

The spool hub uses a printed in place planetary bearing.
There is a choice between a collar that requires a 3mm nut and bolt or a screw together collar with a tapered thread using the threads library by Dan Kirshner.

No need for metal bearings and the planetary gears give a little resistance so the spool does not run on and release too much filament and prevents tangles