A lightweight, compact, totally integrated printhead for use with an Ultimaker and the E3D hotend. STL file is for model preview only. Don't print it! Pull the individual parts from the multibody source files. See the more detail build log at: http://umforum.ultimaker.com/index.php?/topic/1877-e3d-all-metal-hotend-for-ultimaker/page-4 General update after months of use: I initially printed this in PLA, expecting to eventually replace it in a more temperature resistant material. However, I'm happy to say that not only has the original head held up perfectly with no discernable changes anywhere - it has held up for many long prints with extremely high nozzle temps - ie 6 hour prints at 290°C. I now don't see any reason to print this is a material other than PLA.Print each piece on a slow, cool, high quality setting - without support. Print the main body and the clamp piece in the same orientation in which they will be used in the machine. The main printhead body will need some manual correction of curling (flattening edges with an x-acto or similar) during the bridging of the active cooling fan duct, but after that, it's all smooth. The print fan duct should print with the fan mount side touching the bed.