round bookshelf

This is my quick and dirty project for saying goodby to sketchup. It is round bookshelf for my coffee table which is a big cable drum. The segments are screwed together. I used M4 screws. M3 screws should also be fine. If it should be an unc screw the Nr. 8 and Nr. 10 should be fine.
The inner circle has a diameter of approximately 41cm and the outer circle has a diameter of approximately 74cm.
For a closed circle you need to print 9 segments.
Feel free to improve :)