This is a printable mold so you can cast Marvin out of something else. I removed the key ring because I would have otherwise had to break the mold into three parts and I was feeling lazy :P. I used Oogoo to cast Marvin. The recepie for Oogoo is open source. You can find the recipient for Oogoo here: http://www.instructables.com/id/How-To-Make-Your-Own-Sugru-Substitute/ Oogoo sets in less than 10 minutes, and is cheap and easy to make from stuff you can by locally. Give it a try!