The best solution for multi-material printing is some sort of mixing hotend that only squirts plastic from one nozzle, fed by a Bowden system. [Prusa], the man, not the printer, has just ...
Using an optical encoder similar to what you’d find in a mouse, the Prusa i3 MK3 could detect when filament had been inserted into the extruder. This allowed the firmware to pause the print if ...
Because you are locked into the official Prusa print settings, you do not have the ability to tweak things like speed, flow or the number of walls. For that, you need the full PrusaSlicer program.