Importing KiCad 3D model of the board to OnShape is quite straightforward, if you know the process, but the internet is full of complex methods that are no longer needed. After few months since the last import, I always spend some time trying to remember how to do it, so here are my notes.
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Export board as STEP from KiCad (File->Export->Step)
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Import STEP file to OnShape
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Select Combine to single Part Studio
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Open the newly created Part Studio with the board, select all the Parts and join them together to composite part, make sure you mark it Closed. Alternatively boolean operation might work instead of composite part.
The one disadvantage of this approach is that the composite part looses the original colors. You could keep the composite part open if the model is small and you don't care much about performance.
