This is part of another project
An online drawing app that let's you change colors via MIDI Controller

The artwork on the cover of the controller case is designed with Blender and an addon called Sverchok.
It let's you generate curves (in this case with the contour node) and export them to gcode.
The different colors are printed with a diamond hotend.
But should be possible to print with a mmu, as long as you replace every 'T0' command with the appropiate tool number.

You can find the presliced .gcode file on hackaday.io, since .gcode file on here will produce many errors with non supported commands.
Tested it on an original Mk3 and it printed fine.
[https://hackaday.io/project/169743-drawing-app-change-colors-via-midi-controller](https://hackaday.io/project/169743-drawing-app-change-colors-via-midi-controller)

Print instructions

I tested with Marlin, Repetier and an original prusa mk3, all did fine, but here are just some things to be aware of:

-don't print to fast (at least on 8bit the printer starts to stutter because the first layer has alot of very small moves)
-need to support firmware retraction (G10/G11)
-nonplanar first layer infill (moves 0.3mm in Z while moving in XY, might collide with part cooling fan.)
-M221 for flow multiplier (set to M221 S400 during purge)
-file still contains mixing ratio defintions in the form of M163 commands
(if you print with a single extruder, firmware wil usally just ignore this commands)