Thinking of all the things you can do with 3D printers is daunting. It may be easier to attack a list that describes what you can’t do with 3D printers, but the options seems to be shrinking every day as well. Need another example to add to your list? How about 3D printing for concrete molds? Here are some DIY concrete cuff links, made by Make San Antonio, that may spur your imagination. What kind of molds can you build for melted chocolate, wax or crayons?