Multi-material model converts to single material when sliced

I’m likely doing something kinda silly, so forgive the question.

I’ve imported a step file of a D20 of my own design from onshape. The step file includes 21 parts: an icosahedron, and 20 “numbers” on the faces. Upon loading the step file, each part appears to come in correctly and displays in the proper location. Within the per object panel, I can change the filament type of the icosahedron dice to A3, leaving the “number” parts on filament A1 from the AMS.

Once I do so, a purge tower shows up in the prepare tab. All looks well, the numbers are a different color than the dice. Seems perfect.

Press “slice plate” and it all goes wrong. The purge tower disapperas, and the print stats show a single material print. The icosahedron shows as a single solid material, and any evidence of the numbers has disappeared.

So, again, I’m probalby doing something silly that I just can’t see. Anyone have any thoughts?

TIA,
-e

What an auckward issue.

Doesnt pop up any message during the scling or when selecting filament?
Can you share some screenshots of the process? or if possible a short video?

Thanks for the reply, but it turns out it isn’t so much a slicer issue, but a pebkac.

This turned out to be an onshape design problem of mine. When I extruded the numbers into the face of the icosahedron, creating the number part, it didn’t “delete” the part of the icosahedron that interfered with the extrusion.

Thus, when I exported it the icosahedron was literally that, without breaks for the number parts. While the prepare tab showed fine, the slicer chose to ignore the parts that were essentially buried within the icosahedron, even though they could be seen at the serface.

I ended up fixing this in onshape by using a boolian removal against the icosahedron using the numbers as “tools”, then keeping the tools. This essentially removed the shape of the numbers from the solid of the icosahedron.

lmk if that makes sense.

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