My 3 Color Mixing Printer

[spegelius]

Nice. Interested to see how the color mixing works. I tried it on my clone cyclops hotend with varying results, at least some PLAs weren't mixing, but resulted in a more 'toothpaste' type extrusion. Apparently PETG should mix better, but I didn't try ir, the hotend had too much issues and I didn't have anough patience with it...

About slicers: for MMU2S I think PrusaSlicer is probably the easiest to start with since it the multi-material support is written MMU2S in mind. S3D is harder to get working, at least on my setup where I need to use post-processing sw to add the actual tool change gcode after slicing.
For color mizing I don't know any slicer that supports it. For my tests I wrote a short python port-processor to add the mixing ratio commands per layer.
IMG_20200724_103718.jpgIMG_20200724_103727.jpg

Multi-part desings: if you can read OpenSCAD, I designed some multi-part prints that I use when testing my post-processor: https://github.com/spegelius/3DModel...estmodels.scad
Basically the design process involves designin multiple parts and cutting part y from part x when they overlap, making sure the model origins match so that when imported to the slicer the models are in corrent positions. In slicer then just assing models to proper extruders (in S3D this is a kinda PITA to do properly)

[AutoWiz]

Nice. Interested to see how the color mixing works. I tried it on my clone cyclops hotend with varying results, at least some PLAs weren't mixing, but resulted in a more 'toothpaste' type extrusion. Apparently PETG should mix better, but I didn't try ir, the hotend had too much issues and I didn't have anough patience with it...

About slicers: for MMU2S I think PrusaSlicer is probably the easiest to start with since it the multi-material support is written MMU2S in mind. S3D is harder to get working, at least on my setup where I need to use post-processing sw to add the actual tool change gcode after slicing.
For color mizing I don't know any slicer that supports it. For my tests I wrote a short python port-processor to add the mixing ratio commands per layer.

I am not sure how to make them mix. But i understand we must load translucent filaments for the mixing colors. magenta, cyan, and yellow but all translucent. And I saw a place in marlin 2.0.5.3 to enable mixing extruders which i haven't yet. That kinda sucks about the slicers not supporting the mixing but honestly that is ok for now i guess. one at a time is good to start with. I just read all this here and took off in that direction: https://reprap.org/wiki/Diamond_Hotend

Did you get your MMU2S yet?

[spegelius]

Yep, in Marlin 1.9 I had following:

#define MIXING_EXTRUDER
#if ENABLED(MIXING_EXTRUDER)
  #define MIXING_STEPPERS 2        // Number of steppers in your mixing extruder
  #define MIXING_VIRTUAL_TOOLS 16  // Use the Virtual Tool method with M163 and M164
  #define DIRECT_MIXING_IN_G1    // Allow ABCDHI mix factors in G1 movement commands
#endif

The virtual extruders are kind of a preset mixing values to use. To use the 16 virtual extruders, in start gcode I defined the virtual tools by assigning the mixing ratios for each. The mixing ratios are what I thought would be good, but they can be anything as long as the total value is 1. So when selecting T5 for example, would drive 21% E0 and 79% E1.
https://marlinfw.org/docs/gcode/M163.html

; Virtual extruder 0
M163 S0 P1
M163 S1 P0
M164 S0 P1

; Virtual extruder 1
M163 S0 P0
M163 S1 P1
M164 S1 P1

; Virtual extruder 2
M163 S0 P0.5
M163 S1 P0.5
M164 S2 P1

; Virtual extruder 3
M163 S0 P0.07
M163 S1 P0.93
M164 S3 P1

; Virtual extruder 4
M163 S0 P0.14
M163 S1 P0.86
M164 S4 P1

; Virtual extruder 5
M163 S0 P0.21
M163 S1 P0.79
M164 S5 P1

; Virtual extruder 6
M163 S0 P0.28
M163 S1 P0.72
M164 S6 P1

; Virtual extruder 7
M163 S0 P0.35
M163 S1 P0.65
M164 S7 P1

; Virtual extruder 8
M163 S0 P0.42
M163 S1 P0.58
M164 S8 P1

; Virtual extruder 9
M163 S0 P0.49
M163 S1 P0.51
M164 S9 P1

; Virtual extruder 10
M163 S0 P0.57
M163 S1 P0.43
M164 S10 P1

; Virtual extruder 11
M163 S0 P0.64
M163 S1 P0.36
M164 S11 P1

; Virtual extruder 12
M163 S0 P0.71
M163 S1 P0.29
M164 S12 P1

; Virtual extruder 13
M163 S0 P0.78
M163 S1 P0.22
M164 S13 P1

; Virtual extruder 14
M163 S0 P0.85
M163 S1 P0.92
M164 S14 P1

; Virtual extruder 15
M163 S0 P0.92
M163 S1 P0.8
M164 S15 P1

But this method gives only 16 gradients. The proper way to get full mixing steps is to use M165 in the gcode file.
So to get a gradient sweep with 2 colors is to add following codes per layer
M165 A0 B100 ; layer 1
M165 A1 B99 ; layer 2
M165 A2 B98 ; layer 3
etc.
(For 3-color mixing, add C: M165 A1 B99 C0)
https://marlinfw.org/docs/gcode/M165.html

Sadly no MMU2S, no info or anything. Might ask about the status, it's been quite more than 3 weeks already...