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Man if they could figure out IDEX on that it would be a gold mine. The hot end not in use does the filament change while other print head in use. Would speed up multicolor significantly

That is a deceptively difficult concept to implement. G-code like we use is linear and not intended for parallel operations like that. Some folks are working on the concept…

Gcode is meant to coordinate multiple axes. An idex is confusing in that it has a shared y axis for both towards, but you do have T0 and T1 to specify different tools. You could implement E and F axes for different extruders... The with them goes to the slicer to estimate move times...