This is my 3D printed artdeco towel hook that I made for the bathroom. With double sided tape it sticks well to the tile because of the large surface contact area.

I made the design printed with minimal supports by making it an assembly that requires one M4 bronze threaded heatset insert and one M4x10 screw as seen in this image:

If you don't have access to heatset inserts, I have a solid body that you can print. I recommend printing it standing up with and adding a brim.

There is enough surface area so that the part stays stuck on the bed while printing.

Hope you like it!