Thanks for your reply. I have tried again and still get "Unable to slice". Could you send me the Cura settings which you are using? Also, one thing that puzzles me is that the image, which appears in your post, has the top section of the part missing. I have attached a screen shot of what it looks like on my machine. Is this relevant?
I have just discovered that Cura3.5.0 is unable to slice any of my previous models, so it looks like there is a problem with my installation Cura 3.5.0. I will reinstall it and try again.
Interestingly, I was able to upgrade to Cura 3.5.0 originally (see above) with no problems. Last night, it would crash any time I loaded a new STL. I finally deleted the app (MacOS) and profile (~/Library/Application Support/cura) and re-installed and it seems to be working again.
I am able to slice and save it using Cura 3.5.0 on MacOS 10.13.6
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