Key Holder

The conventional key ring is not very conducive to pockets. The plane of your keys is perpendicular to the plane of the ring, forming a shape that cannot lay flat. There is always some edge poking into your leg.
This is a work in progress, but the idea is a thin form-factor key holder capable of holding 3-4 keys. The thumb wheels swivel around and catch their respective key. A swivel in the opposite direction pulls the key back into the case.
You might have to adapt it to fit your keys.. Also, my original intent was for two house keys on one side and one large car key on the other.. as the model stands, some of the keys will catch on each other.
Software:
Model was designed in openscadpy (first project, sorry for the poor state of the code): https://github.com/hmeyer/openscadpy
Model was printed on up! pp3dp.com with the following settings:
quality: normal
part: 4 layers, hollow, 40 deg
support: 4 layers, 40 deg, 4 lines, 3mm2
Future work: It works pretty wel