http://trinitylabs.com/products/trinity-metalmagma-all-metal-high-temp-hotend another upgrade for the robo3d once it arrives. Will allow you to print with all available filaments currently on the market. wooohoo. no worries about peek meltdown. based on the j-head so it should be plug in play mounting wise. Mine is already on order! downside it uses 3mm filament at the moment so you have to make a couple of changes. (ie.3mm filament roller gear for one. there maybe be others but can't really be sure till we get our printer.) but hopefully the 1.75mm version will be out soon and we wont have to worry about it.