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UM3 switch to printhead 2 at xx height?

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Split the model in two parts at the height you want to switch. Then you assemble the parts in CAD, and export STLs of the single parts (from the assembly view, so that the coordinates are correct). In Cura, you open the STL parts, assign different extruders to the parts, then select both parts, right-click and select "merge". 


(BTW, that is the standard multi-material-print workflow)

Edited by P3D

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Maybe this can be done with a Postprocessing Script in Cura, but in a quick check I haven't found such an option.


Easiest way is, that you cut your object in two pieces, put both to Cura, set the bottom object to use Extruder 1 and the other one for Extruder 2, then combine both object in Cura. Then you should get the result as expected.

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