Hello,
this is a stackable drawer compatible with Sunlu spools.
You Just need to print 4 slots and make 4 holes in every spool.
Keep attention that every hole has to be aligned between spools if you want to stack them.
They are connected between 4 sticks that are used to both keep slots in place and also to stack spools.
At the bottom of first spool and at the top of last one you can use dedicated caps instead.

There is available also a base that allows spools to rotate.