I needed to mount some more spools inside my enclosure. So I present to you my first take on a spool holder. I had fun designing this one and was inspired by a piston rod from an engine. It has been tested with a 1kg spool.
Instructions: Print on the longer flat side, not the mount. 15-20% infill. Use an extended driver bit for mounting.
If this needs any design updates please post your suggestions in the comments. Cheers.