Hexagon CD slim case shelf, perfect for those hundreds of useless CD cases laying around.
It can be mounted with strong double tape or dowels for extra security.
It's a simple design, so it can be printed at max speed. Printed mine at 100mm/sec, 0.4 nozzle with 0.3mm layer height.
Optimized for 0.4 nozzle, the walls are 0.9mm tick