A simple holder with a door-stop functionality(duh).
It finds use when you're unable to install any 2-part, or a wall-mounted holder.

I designed it to be installed on the floor with 20mm double-sided Tesa tape, underneath the door with 10mm clearance. The door it holds is 40mm in thickness. 

Print on the side. I did mine in petg and pctg with 5 perimeters.