I recently learned that some months ago already Ultimaker stopped mounting the 5th stepper driver chip to the electronics board of the Ultimaker2. This basically means you have no option anymore to experiment with dual extrusion options. It also means experiments like this are no longer a option, unless you change your board. https://ultimaker.com/en/community/10657-a-different-multi-extrusion-approach-um-tool-printhead-changer?page=46#reply-164412 While Ultimaker obviously has the right to ma