Door hook with optional extension

This is a hook designed for doors with 40mm thickness.
It can be used alone or with optional extension.

Depending on your infill settings you can increase extension count. I only tested with 1 extension and it's enough for multiple things like a bag with average heaviness and a heavy bathrobe etc. But using more than 2 extensions might be overkill I guess even though I tried to design a strong top to withstand the weight.

You may need to sand some areas or sharp turns touching the door to prevent damaging it.

Let me know your experiences in the comments please :)

Print sideways like shown in the picture with blue one
2 walls min.
30% infill min. 
skirt = adviced
brim = no need if you have good bed adhesion