Self-closing (unlevel) door stop

This is a very simple, yet effective tool to stop a poorly level door from self-closing. It works by adding friction into the door hinge. I'm including the original scad file as this is probably too specific to my door hinge to be otherwise useful. Editing the inner and outer diameters should be sufficient.

I placed one of these rings each into the top/bottom hinge (between the static and moving part, onto the door hinge spindle) and all self-closing has stopped. Time will tell if this is eff