I have designed this for myself to organise my filament spools and save tons of space. As you can see, you can stack 15 shelfs with filament in it on top of each other with ease. The construction will stay with no problem.

I have made 15 of them in a matter of couple of days, but in result I got my filament well organised and easy to access.

It has little locking cylinders on top and slots for them on bottom to attach one shelf to another to keep them in place on top of another.

It does fit all of my filament rolls just perfectly, but I would suggest printing one first and see if it fit your filament brand. If not, just scale it up by 1-3%.

Since this is my first upload on Thingiverse, any tip would be greatly appreciated and I will make sure to upload more useful things here :)