Best way to do this?

I was wondering if the partial vertical walls might be caused by a flaw in that part of the STL and if they might go away with that area left masked (no umasked holes). The STL and mask files would be most welcome.

How can i send you the stl?

That’s a pretty bad omission I think. I use STL a very lot and to be able to save work is important.

Thanks @Frits. It looks like it’s an Estlcam issue because the extra paths go away when the opened STL is rotated horizontal (mask edited to match).

That’s what I thought so.