Spool holder for 8mm rod type spool rollers (standard & large)

This is my design of a spool holder holder. Weird, I know. It's basically a stand for 8mm rod type roller spool holders and is simply a drop in holder. There are two sizes:

STANDARD
I used this spool holder https://www.thingiverse.com/thing:1241566 as a reference and it's for standard sized spools up to 1 kg. The base measures 138 x 220 mm, height 130 mm.

LARGE
I used this spool holder https://www.thingiverse.com/thing:2070272 as a reference and it's for oversized spools (2 kg and up). T