I still find that interesting. I’ve done a 8 hour 3D file and didn’t have issue.
What was the line number shown in CM after reading the file ? Mine said 10,5xx,xxx
I don’t recall. It’s been over a year. 
As a Miata owner and fan, I am thoroughly impressed by your mission here! I have a Shapeoko 4 but have never tried something this complex/cool. Using it for wall art?
IDK what I will do with this.
When I first bought the Pro 5 ( June 2023) , this kind of project is what I had hoped to get to.
Thanks to the folks on the forum, I have learned SO much.
I stumbled upon a cache of cutoff Pine beams from a local company that makes Post and Beam barns. The material was big enough ( and small enough ) that I could give it a try.
I am also old enough now to laugh at myself when I screw up. I wish I had learned that much earlier in life, but I am here. All good.
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The 3/4 round nose did the trick. The stepover was ,050 which made a .002 cusp.
The runtimes for 4 Scallop paths was under 90 mins.
The surface faithfully represents the “dirty mesh” . I will need to get better at cleaning results at the right time in the processing.
The area at the bottom of the mouth was not finish cut. It was time to stop.
I had to add geometry under the nose to have a platform and a clean edge.
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