If you have unused CDs, DVDs, BluRays or other discs with an inner hole of 15 mm in diameter, you can use this system to turn them into a small shelf.

1. Place a disc on the base part of the system.
2. Slide a tube segment onto the base part.
3. Place another disc on the tube segment or use the spacer to extend the tube length by one more tube.
4. Add as many layers as you like and it is physically possible.
5. Finish the top layer with the end piece.

My other upcycling stuff:

Do you have old filament spools lying around? Turn them into a beautiful painting turntable to save them from the trash: https://www.thingiverse.com/thing:4838023