Simple and robust spool holder with Flying bear ghost 5 mount (no drilling, just unscrew old and put the new one).
Unlike default holder that can fit only narrow spools, this one can fit any 1kg (or more) spool. It is round and allows smooth rotating. The holder is slightly tilted (2.5 degrees) so gravity prevents spool from falling down.
There are 2 versions available:

1. Split in 2 parts, so no supports needed. Glue is recommended (I use without glue, it fits pretty tight).
   holder_cyl.stl
   holder_mount.stl
2. Single thing - requires supports.
   holder_both.stl

There is also source holder.scad file available, so you can customize/edit it for your own case.

Flying Bear Ghost 5

No

No

0.2

35%

I printed with 0.8 nozzle