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that is me being an idiot and posting a bad .stl file. was making some edits in fusion, got the change to a point I was happy with it, and exported the .stl

unfortunately, I forgot to wind the timeline all the way to the end first....So, every step after my edit (including all the steps where the track's channel get created) were not in the exported model.

I re-exported all the models and uploaded them just in case I made a similar mistake on another part.

sorry for the confusion and hassle........