This is a 4 Layer model of the well known dude.

Not 100% sure about the copyright tho. I took the picture from the net. Lets not draw the line here … this is not nam.

The idea is to make this a 4 color print. Every 0,6mm 
A friend thought this was just a printed picture on the wall. So consider the amount of work you put into it hehe.
Each Layer is 0,6mm heigh. You can scale in Z axis to fit your layer count / height.
My print has a scale of 0.5 x in Z so I had 2 Layers each color with 0.15mm Layer height.

What in gods holy name are you blathering about… get to the gcode already…

Print instructions for the model I printed:

1. with G-code: 
   (2 Layer per color, 0,15mm layer height, makes 1,2mm model height
   PLA: 60° bed 205/210°C nozzl)
   I used the complete MK3 length. (240mm without skirt / brim)
   Just change the color after every G-code file. Do not touch the axis when changing the material / color because bed leveling will only be done at the start.
   The nozzl temperature will be shut down after the every color but the heatbed will keep running. Print time about 4x2.5h. You can increase the speed with increaseing the feedrate. (thats what its called in octoprint)
    
2. with STL-Model
   For multicolor I put a small square model to one side so the ejection pressure can be built up when changing the material. You should do the same. You can scale the model in Z axis. (I scaled by 0.5 in Z).
   If you scale also X and Y smaller maybe putting on “allow printing single perimeter shells” should be activated due to the small lines on some areas.
   
   my G-code optimizasion in Simplify3D with MK3s are:
   BOTTOM 1.color (Ivory white) 
   Start Code: 
   "put your standard here"
   
   End Code: 
   G1 X0 Y0
   M104 S0 ; turn off temperature
   
   MIDDLE 2+3.color (red and grey)
   Start Code: 
   G1 Y-3.0 F1000.0 ; go outside printing area
   G92 E0.0
   M221 S100
   M900 K30 ; Linear Advance PLA
   
   End Code:
   G1 X0 Y0
   M104 S0 ; turn off temperature
   
   TOP 4.Color (Navy blue)
   Start Code:
   G1 Y-3.0 F1000.0 ; go outside printing area
   G92 E0.0
   M221 S100
   M900 K30 ; Linear Advance PLA
   
   End Code: (your standard)
   M104 S0 ; turn off temperature
   M140 S0 ; turn off heatbed
   M107 ; turn off fan
   G1 X0 Y200 F2000 ; home X axis
   M84 ; disable motor