Imported Rhino .3dm artifact issues

[stepalibre]

I am testing 3dm workflows for my Rhino/Grasshopper addon. One side of this test model has artifact issues after I added a cut feature. I don't understand why only one side would be affected. Has anyone seen this before?
Thanks

Planning (WIP) • Testbed-for-Alibre-Design

Planning (WIP)

github.com

 

[stepalibre]

These settings fixed the issue.

 

[DavidJ]

Best settings for import can take a bit of experiment. I have a 'usual' set of options, but sometimes they don't work so well. Especially if you are going to be editing the part after import, it's worth having 'check part' and 'import advisor' turned on.

An import can look OK, but still have issues that will interfere with subsequent modelling.