This my first model after learning 3d modeling for 1 day in fusion 360. Designed with https://makerworld.com/en/models/56653#profileId-58286 as reference.

Each holder will fit 6 mini spools that has outer diameter of about 30mm and 11mm wide.

There are 2 versions of holder to print.

Frist one is printed vertically(see second picture), this provides the best quality for when there are spool missing. There are minimal support, they will take a couple minutes to remove but no support will print just fine with visible shine if printed in silk.

Second one is printed horizontally, this requires no support but due to layer heights, it can be a bit ugly, see third picture.

There is also a plate to hold 4 holders for better transport.