Update Feb 22, 2021:
I added a Version 2 with wider (10mm) and larger (15mm) columns for more rigidity.

I like the Filler spool holder and I was looking for one remix to use it in my AM8 printer (2040 extrusion) so I found Technoo10201 design; However, my print volume is not large enough to print it as it is, so I just took his design (thanks for the STEP file!), split it in two and added a couple of columns for alignment and easy assembly. I glued the pieces with CA glue and so far it works fine. I added a 0.05 mm gap between the pieces (columns) and it is a tight fit after printing them in my printer.

AM8

No

Yes

0.2

30%

While the lower part could be printed horizontally to avoid using supports, printing the upper part horizontally could be tricky, so I just printed both vertically, using supports on the lower part.