(multycolor) excess material extruded after every filament change  

(multycolor) excess material extruded after every filament change

Hello, 

i am trying to do some multicolor print but it always fail becouse of excess material extrusion, after every color change, blocks printing head.

i have mk4 with current firmware, using prusaslicer. I use octoprint but tryed it directly from usb too.

i did only few changes to default profile - extruders: 7, enable single extruder multi material, added line to "tool change gcode" (M600).

for purpose of this post i only used 2 extruders but this issue is same with whatever numbers of extruders.

more indepth description:

right after color is finished printing, head goes up (which is not great becouse nozzle will return to this spot with new color and will leave dot of this new color) and there is a request for new filament. I remove old, insert new, continue printing. nozzle returns back to last printed position, then moves to next position to start printing with new color - and here is my issue. right befor normal printing, it extrudes, like, 5mm of raw filament in one spot, creating blob of excess material wich will later block printing head.

Thanks.