I modified AlexEnglish's EF adapter (http://www.thingiverse.com/thing:10829) to make a body cap for EF and EF-S cameras. I have tweaked his dimensions and it now fits very well.I printed this on my FlashForge Creator using black ABS at .2 layer height, 10% infill, WITH Support. I don't think this would work very well without support because of the overhanging bayonet threads. I haven't figured out how to make chamfers yet in OpenSCAD (this is my first OpenSCAD model)