Copymaster3D Thin Spool Holder

I recently got a Copymaster3D 500x500 printer, and it ships with a non-standard (unusually large) spool holder and one sample spool.

This will let you use most other spools instead.

*Update*

Note that while this works, it's debatable whether you want to put 1kg of weight on the Z axis, since it already sways a bit when the build plate moves around. I'm thinking of switching to a wall-mounted spool holder instead.