Josef Prusa's new nozzle pushes the boundaries of safety as well as capabilities.
If you follow news about 3D printing, you've heard the name Prusa before. Josef Prusa has been a driving force behind several improvements in the 3D printing world and is the author of Getting Started With RepRap.
I've talked to Josef several times in the past, and even though he contributes to the RepRap family tree regularly, he had not had his own company until very recently. He has changed that though, with Prusa Research, out of the Czech Republic. His first actual product is the PrusaNozzle, an all-steel hot end for a 3D printer.
For those who may not be that familiar, the hot end is the part that actually melts the material that you are using to print with. Most hot ends include combinations of brass and PTFE (polytetrafluoroethylene). Josef's, being all stainless steel, is technically food safe, although you may end up searching a little bit to find a food-safe material to pass through it. Food safety concerns aside, being all steel means that he can get it much hotter, opening up the list of materials that you can print.
The PrusaNozzle is milled from a single piece of steel, and the inside is polished to ensure that material will pass through as smoothly as possible. As with anything Prusa does, the PrusaNozzle is completely open-source.