A really nice design by Mit_Upadhyay.
https://www.thingiverse.com/thing:4108242
I got the problems when slicing the model with cura 4.4.1.
Therefore I cleaned the mesh using meshmixer.
Also I added a hook in the back to hang the model on the wall.
I include the model of the hook as a STL and STEP file to this thing.
It is designed for a bolt with a diameter of 3mm (7mm head diameter).
The author marked this model as their own original creation. Imported from Thingiverse.