I want to enable not-used pins for UMO double nozzle in Modifications, third party add-ons & other hardware Posted June 15 good news! (at least for me lol) I've launched the M42 command with Repetier host and I have found all the pin enabled. Now I must understand how to write the Gcode properly In the Cura Propeties: Machine settings - Extruder Start G-code. What I wish is to do is: 1- Retract the filament while it hops on the Z axes; 2- Activate the corresponding pin so the changing nozzle sistem is trigged via the electromagnet; 4- come back to the print position while the filament goes foward; 5- continue with the normal G-code Since cura lets me to write G-code at the beginning and the end of each nozzle movement I have now to Understand what is better to write at the start and what at the end. And How to write it in G-code properly. I'll be out for a while... hope to find some time soon to test it.