Here is a simple printable spool rack. Can be adapted for any number of spools. The rack can be stacked for a low footprint storage solution.
20mm wooden dowel used for the spool storage rack.
Update: 12.01.22
New version added with 22mm holes.
Update: 30.03.22
New version added with 30mm holes. Warning: It is unknown if this version will print correctly / still be stackable.
Update: 10.23
New version added with 24mm holes
The author marked this model as their own original creation.