These were created using jasonwebb's Circular Two-part mold generator for demoing my Oogoo Mixer http://www.thingiverse.com/thing:84579. I include my modified version of the mold generator so you don't have to fool around getting the name of the stl right and the files in the right places. All credit to jasonwebb. The process is well detailed in jasonwebb's posting. I don't know if these egg holders will actually work, but they served perfectly as a test object for my Oogoo Mixer. And I know they could be modified to work - Oogoo is the perfect material for gripping eggs.You can make the molds by simply printing the stls for the mold. The stl for the eggholder is only used by the jasonwebb mold generator. Follow the directions and see the video linked in my Oogoo Mixer Thing.