The Awamoko 3D Foam Pen from Japanese toy manufacturer Shine uses the same foaming hand soap that you find in public restrooms. There is no heating element like with standard 3D printing pens, so it is perfectly safe for anyone to use, even small children. And users don’t have to do anything to make the pen extrude foam, just press the button and the foam starts squirting out at a slow enough pace for you to start building up layers for a large soapy object. The foam pen comes with a ton of accessories so you can actually do some pretty serious foam sculpting, and it includes decorations like eyes, ears and tails to make your foam sculptures look more like real animals. You can read more over on 3DPrint.com: https://3dprint.com/140098/3d-printing-pen-soap-suds/