Self sufficient spool holders for different kind of 20cm spools (width and central diameters).

Hi,
I bought over the time many different spools from different vendors and discovered their central axis hole has different diameters, and the spool width was also varying.
So I first built fixed size holders, then came to create a different diameter adapter, then ended up with a variable holder that can fit any width.

Print with low infill, no support and enjoy.