Stackable spool rack

Stackable spool rack *from 3D printed parts and Ø8mm aluminum rods.Sturdy, stable.Infinite in length.Infinite in height (I found that a minimum of 200mm rod (vertical ones) length between racks provides proper access to load and unload spools from the rack)Infinite in stacks. What to print:bottom part; mandatory as it's serving as the bottom rack and the racks that are to comemid part; only if you want at least 3 rackstop part; the end of the stack - interchangeable with mid part (you can ad