Metal Parts from 3D Prints
This is a tutorial on how to cast low-temp metal alloys using 3d printed molds. The process involves common tools and supplies - a 3d printer, silicone rubber, a hot plate, stovetop casting alloy, and a dollar store skillet. I used this process to generate locking plates for my Flat-Pack camera arm, but the same method can be used to cast more than metals - anything from chocolate to plastic, with the accuracy only limited to the precision and resolution of your printer.
Crystal Glow Knuckles
Ok, maybe not sting like a bee. With these squishy cast silicone crystals, it'll be more "sting like a gummy bear" but that's part of the charm. This 3d printed Pro Trinket powered NeoPixel ring contains all the brains, battery, and lights to put on a stunning show.
Soft Quadruped Robot
This squishy robot walks using only two inputs. You can make your own using a few easy to find materials and some 3d prints.
Silicone Robo-Tentacle
This squishy tentacle robot has no hard moving parts. It's entirely powered by air pressure.
If you've got a 3d printer chances are you can make your own working tentacle in a matter of days.