Hi,   I have an UM3 printer and use it for a year and I could update the firmware as well two times wihout any problem during this period. Even more, I have purchased a special Solex Hardcore head and Ruby Sapphire nozzle for carbon fiber filament and I used it with satisfaction. However, I was not really amazed with the operation of the original extruders, therefore a few weeks ago, I also purchased two DDG Bondtech extruders from Solex. After their hardware installatio