I have been away for a few days - back to "exceed dimensions" !!
The 3DSimplify was a new purchase, so I have not altered anything except machine details, so factory file is default.
I have tried importing many models that I know are small ( mine and also from thingverse - down to 70 x 70 x 70 mm size)
Attached is screenshot of machine options
I have been able to manage to get a model imported about 3 times (out of about 30 attempts) but I cannot manage again immediately after, trying to replicate the steps I previously tried.
Also, now that I have actually tried to print, I cannot get 3DSimplify to successfully connect to the printer.
Another software (matterControl) has no trouble connecting, or importing the models.
Again, I have managed about 3 times to connect (out of 50 attempts)
I have tried installing the software on another computer (an older macbook pro). The models import OK, but no connection. I cannot find any difference in preferences settings between the two machines.
Any further suggestions?