How to 3D print a surface model?
Maybe 1st of all try to write nicknames correctly (will be helpful to find model)..
If you tell about bmw m6 , than remember in what program you are working - SOLIDworks
You must sew surfaces, and make the body solid
E.g.:
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Step 1:
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Step 2:
select borders
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Step 3:
sew surface
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Step 4:
checkbox = make solid
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Step 5:
As you can see now it's solid
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Step 6:
Just like this one you must do with whole body.
Make new surfaces for that detailed view, that you want