This is a simple hook to put on the top of your door, it will function for smaller or more lightweight things. In the picture i have included under, you can see that it works perfectly for backpacks, and similar things.

It is designed for doors with a width of 4 cm, if your door has diffrent dimensions than this, you may need to edit the model to make it work.

When i printed it i used PLA, and a infill of 10%