Four Thirds Rear Lense Cap

This is a Rear Lense Cap for the four thirds lenses, not the micro 4/3. The ones I know that use this are the Olympus E3 etc, not the Pen and OM-D which use micro 4/3.

I made the outside of it a little smaller then the original caps but it seems to work fine and saves some build time and material. The opens cad file is here so if you like it bigger feel free to.