The perfect way to organize your shower things.
No drilling necessary. 

It is stable and water tested!

The only thing you need are suction cups: https://www.amazon.de/dp/B0B2R4D3WM?psc=1&ref=ppx_yo2ov_dt_b_product_details

Of course you can also drill it. There are cut-outs on the back for this.

Unfortunately, the test model did not turn out very well because i had not yet calibrated my printer to PETG. 

This resulted in under-extrusion..