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Different materials for the top/bottom skin

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Posted · Different materials for the top/bottom skin

I am inspired by this video https://www.youtube.com/watch?v=KV2AjyowXX4 to try printing with multiple color on my single extruder U2+,

My idea is to use a different material for the top/bottom skin, by swapping the material before and after printing the skin.

I want to make a post-processing script to add a "M600 - Filament Change" to the gcode.


Now my question is is there a script that already does that? I am aware of the "Filament Change" script but it only does z level now.

Also, is there a option to only change number of walls for top/bottom?

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Posted · Different materials for the top/bottom skin

One thing to consider:

the UM2(+) does not support M600 AFAIK, but you can change the filament during a normal pause (M0).


To mimic the stacked processes of S3D one has to print one model / color after another. I don't know if this is possible (only) with post-processing?

The simple way would be to start each "layer" as a separate print, just take sure that the buildplate stays hot between the prints.

Or perhaps combine the gcode files with some scripting?


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Posted (edited) · Different materials for the top/bottom skin

Hey, you made the firmware I am running! :D


I have finished the script, and it does what I wanted:


The T-rex looks a bit sad but I should be able to fix it by tuning the retraction setting.


The M600 command is ignored, but the M0 works just fine, just needed to modify the other pausing script a bit.


And it turns out finding the top layer is not so straightforward, I tried using the ";LAYER_COUNT" value-1 but that gives a bigger number sometimes, using "data[-1]" just give me M107 and the things after. I end up going backward in the data and just use the first layer I found.


If anyone want to try it here's the script:




Edited by cashlo
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