Door Holder (Open)

This is a remix of Worlds6440 https://www.thingiverse.com/thing:891278. That will go over an existing door stop spring. I didn't want to remove my springs and also noticed that his design was too short for my door handle spacing to the wall.
Just press down, or lift, your spring about 1/2 inch (12mm) with your foot and it should slide in and hold your door from slamming shut. (The same applies for closing your door. It pulled the cap off of my spring. :) )
I've included a dropped version because the lowest usable edge of my Garage Door was slightly above the matching spring mounted in the baseboard.