This tool can be used to change the nozzle of the Ultimaker 3 without breaking anything. It's only to be used with the HardCore from 3DSolex! Use at your own risks and with caution :) Print it in one color (or dual if you want) and slide the tool provided with the Hardcore kit. Depending on the material you may need to apply a bit of force to insert it. Example in the picture was printed with Biofilla Platec and Colorfabb PLA/PHA (red). Print with some infill (at least 15% and 3 shells). 26/02/2017 Added thin version that will print faster and easier in dual (no more vertical text). Print on the back. 01/03/2017 Added even thinner version with a bit more tolerance for the tool hole 14/03/2017 Video to use the nozzle changer: https://www.youtube.com/watch?v=UljrLKWlmdI 29/05/2017 Added design with larger trumpet insert (Compatible with the previous logo model) --> UltraThinMainBodyLargerTrumpet.stl