I have been diagnosing your model to drawing issue. It seems to be caused by the spur gears. If you isolate them and do all the rest of the components, there is no issue creating the base drawing. I guess it is choking on all of the teeth especially since you are not using optimize in your patterns. You are also patterning a lot of geometry. If you edit your pattern in the second spur gear, 480 tooth, it gives you the warning about the pattern. No only this but you were patterning the complete body 480 times instead of just the teeth and fillets. I re-constructed this gear to separate the teeth and the fillets from the pattern and it makes a world of difference. You can make a 2D drawing of the gear now when before it would hang. My model is attached isolated on the gear I modified.
You also have some nasty errors (red in your timeline) concerning deleting faces which I suppressed in my diagnosis.
John Hackney, Retired
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