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How to import multi-material objects?

Is it possible to import a single object that has multiple materials pre-applied? For example, I use blender to pre-assign 4 different materials to my object. How can I get these material assignments into canvas?

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I found that the best way to do this with blender is to edit your model in blender (go into Edit mode), hit P to then split your model by material. After that, export each of your 4 different materials as separate STLs, then import into Canvas as a multi-material object.

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Looks like I spoke too soon. If I assign materials to polygons in another (more sophisticated) modeling program and import them as two separate objects into Canvas, then when I go to slice it, Canvas thinks the objects—when combined—are hollow. This is very unfortunate, since I obviously want to my combined object to be solid. It would be nice if there was a way to import material assignments from another modeling program (through something like a wavefront .obj model).

The coloring capabilities inside canvas are cool, but not sophisticated enough. Painting individual polygons when you have a 30k polygon model is impractical. I think the only other solution is to create fully manifold colorings in blender. For example, I would have to extrude (in the modeling sense, not the printing sense) my surfaces inward to created manifold pieces.

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Rob will be eternally grateful.
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