Empty 3d adaptive toolpath - helix ramp

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I've been unable to debug exactly why my 3d adaptive roughing toolpath won't generate, have narrowed it down to ramp - plunge will generate (though with collisions which I think are due to the plunge??), helix ramp won't, even when my ramp diameter is set really small and also minimum radius is really small. I'm sure it's something obvious, but I've looked at videos etc on the subject, been looking at it for a couple days and my brain is fried.
The design is from stl I downloaded, if it's bad please let me know (though I have the same problem with a couple designs from different sources). The two Adaptive toolpaths should be almost identical (I derived one from the other), I just changed the Ramp in the second to plunge and then the toolpath generated. I would really appreciate some help.
I made a public link at
oops that just looks like object. Just dropped an archive into attachments.
if there is a better way to bundle up and get you the whole design environment please point me to it. Thanks!!