7 Colors on 1 Layer  

7 Colors on 1 Layer

I would like to print 7 colors into one layer and some more layers on top of it on my MK4S without MMU using Prusa Slicer 2.9.4. The Prusa Slicer allows color changes only layer-wise on the left bar. So I spent many hours trying many things. Let my describe only the promising ones. 

• The most straightforward way would be to add filament changes on the bottom bar.
  • But this seems not to be supported in Prusa Slicer. 
  • So I have split my object into 7 parts in the design and imported them as parts of an object as to maintain their relative position. 
• I tried to increase the number of extruders to 7, enabled Single Extruder Mutli Material, assigned a different extruder to each part and defined a Tool change G-code M600 (=filament change).
  • This didn't work. I discovered that Prusa Slicer handles only up to 5 extruders. Maybe this is why. 
• I tried to set the numbers of extruders to 2, enabled Single Extruder Mutli Material, assigned an alternating extruder to each part and defined a Tool change G-code M600.
  • This time I got a gcode with only one M600 command, where I needed as least 6. The slicer optimizes the tool changes away. First all extruder 1 parts are printed and then all extruder 2 parts. And I can't help it - especially since this optimization parameter seems to have been recently removed.
• I have looked for an option to manually set the print order of the parts. But I did not succeed so far. 

It may be important to know, that the parts have a low distance of e.g. 0.05 mm, since I want the printer to melt the filaments together. 

Any idea?