Door Holder

If you have a door that won't stay open, this is the thing for you. It's a simple, quick print which mounts on the back of a door with double stick tape and/or a screw. It grips a doorstop with enough friction to hold the door open, but still can be easily pulled shut.
Mine works with a spring type doorstop, but it should work with other types by simply scaling it as needed.

http://youtu.be/SVnEKdk9svU