Current state of affairs with my project on compressed air cooling
http://b.bonkers.de/?p=392
Another testprint using TPU. The object is 30mm² and the cones have an upper diameter of 1mm and lower diameter of 3mm. Printtime was 45min.
missing/deleted image from Google+
What is the red printed part on your hotend?
@Kura_kuea it’s not printed, that is a silicone sleave http://b.bonkers.de/?p=158
@Bjorn_Marl Ah ok, looks printed even on their site. 
@Kura_kuea That is my site and i used a printed mold.
Nice ^^
What kind off pump do you use?
@Rikard_Karlsson i tried several aquarium membrane pumps, they all work except the very small ones. A single 200L/h pump is good to cool a hotend. For part cooling you need more volume.
@Bjorn_Marl I appreciate your posts. I usually lack the time and drive to get passed the duct-taped-paper-clip-state of my printer upgrades so while things usually work pretty well it’s refreshing to see similar ideas in a more professional state 
@korpx I have the drive to bring my printers to a point where i can fire and forget. Just beeing able to start a job and only look at the machine again when it’s finished is what i aim for. I have that state with my old printer, but it is slow and limited in quality and what materials it can print. At the same time i want to contribute to the RepRap project, since it gave so much to me. The DuoCube and the extruder are scheduled to be made open source once i am satisfied with it. You are very welcome to add some of it to your own designs.
What filament did you use for the cooling parts?
unpigmented ABS, it’s what i make most of my printer parts of.