When printing things that have only a small amount of a second color on only the top layer, building up a huge tower all the way up to the full height of the print seems like a waste of material. It would make more sense to add material to the tower only when switching materials, and lower the print head down to the bed as needed, rather than building it all the way up just so you don’t have to change the z-axis position while cleaning the extruder. Thoughts?
Also, could you update your product manuals to not say that the breakaway filament can be used for calibration? Calibration fails badly if you use the breakaway filament, because the extruder doesn’t get hot enough for the material to flow properly.
Also, could you make the calibration temperature be adjustable so that it can be done with any material, not just PLA? I opened a brand new container of PLA and breakaway PLA just to do this, and then had to go out and buy another container of PLA because the breakaway PLA won’t work, none of which I’m likely to ever use for anything other than calibration…