A holder for multiple spools with variable spacing, the pins can be loosened and tightened to slide them as needed or removed altogether.
All parts print flat without supports, though the pins benefit from a brim. Designed for M3 heat–set inserts in the pins and 6mm to 10mm M3 screw glued into the carriage block.
I did print this design, but I never took any photos, so I'm using a render for the cover. I also tested it and it works as intended.
The author marked this model as their own original creation.