This design provides a place to hang your keys and set your wallet. I keep mine near the front door so I'm far less likely to forget them. It can mount tot he wall with two screw using the provided slots, or with VHB tape.

PLA or PETG are fine with this design. I used .2mm thickness, two shells, and 25% infill.  I typically prefer to add a brim. Sometimes the edges will lift a bit. 

Update: Added a large and small variation. 

Enjoy!