For me, the tricky part about this was modeling the locket. I am by no means a stranger to 3D modeling; It is just that my skills are a little rusty. After teaching myself 3DS Max when I was 15, and then spending two full years of college doing 3D animation in Maya, I left the world of virtual 3D forms and did not look back. Over the years, all of the trauma was carefully purged from my head while I spent my time making real things. If I had known ten years ago that by making virtual things, you would some day be able to press a button and get a real thing in return, I may not have been so quick to flash my memory. Anyhow, while I may have been quite good at 3D modeling 10 years ago, I am currently in the process of relearning a lot of the skills. Fortunately, it is coming back rather quickly.
I am including two different sets of files. The first set is the 3-part locket in STL format for people without 3DS Max and who just want to figure this out on their own. The second set is the 3DS Max file that is set up such that it will be easy to import and insert your face into the locket. The following instructions will show you how to use the 3DS Max file to complete and export your own custom locket.