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Looking for help with shell - open surface


New member
Hello everyone,
Iam new to Rhino.
In my master's thesis Iam creating a pc mouse - a negative from my hand - so I created a model from sikablock and then scanned it -> i got crazy stl model - edited it with some free programs and tryed to work with it in solidworks - model is somewhere corrupted - cannot use remove by extrude etc.
So I got an advice, that Rhinoceros could be my saver - in means of creating a 3mm thick shell (direction - inside) and exporting it into iges so Solidworks would be able to edit it.

So far i have an open surface.

As I said, I have never worked with Rhino and so my tries are failing.

Would anyone be willing to help me out with this?
Thank you in advance.
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