The file 'Doorknob Wall Guard 3D Printer Model' is (stl) file type, size is 13.1KB.
In one of my bathrooms, I noticed a poorly filled/refilled area where there was at one point a door guard for the door knob. Rather than mucking up the wall, I used the dice-shape in Tinkercad and made a 4"x4" (102mmx-102mm) by 10 mm square disk.
I have some industrial double-sided tape, but I assume regular double-side will work as well.
doorknob_wall_guard.stl | 56.1KB |