Smooth turning spool holder for 30x30 frame

Spool holder for 30x30 3D printer frame.  Suitable for heated chamber printers where spool fits in chamber – be sure to use suitable filament for heated chambers though (like ABS)!
 

From bracket mount face to centre line of spool, it is 103 mm.  Spool from back face extends 98mm.

For the outer nut, note that I did scale in the X and Y direction by 3% to make a nice loose spinning fitting (2% may work better, a little less loose but the 3% still locks on a spool just fine).

Hardware wise, using two 5mm ID by 9 mm OD by 3mm deep side by side bearings (these are the extra ones that come from a Titan Aero kit) and a 3mm x 50 mm screw.   Alternatively, a 5mm ID X 9mm OD bearing works without the adapter.

This is a remix from https://www.thingiverse.com/thing:4649148