I always wanted to have my spools horizontal, for space reasons. Unfortunately, all the horizontal spools holders that I tried were way too unstable to trust them, or didn't fit all of my spools. Therefore, I designed the UHSH.
I added friction to it to avoid any kind of tangling. So far, I've used around 10 spools end to end without any issues on this thing.
The print consist of 3 parts:
Spool Holder: The actual holder. It has 3 small legs so it has the perfect friction to make the spool roll, but don't go crazy. Print with support.
Spool Base: It sits on the base of each spool. Print without support.
Spool Top: It sits on the top of each spool. Print without support.
https://www.youtube.com/watch?v=jwMVoLI-aZU
Notes:
Support required only for the stackable spool holder. Suggestion on how to improve the design are welcome!