is there any reason that surface knit command does not make a solid body ?

i'm working on MQ-1 predator i try to make one solid body from the tail and the body by using surface knit command in solidworks............it gives me a solid surface not solid body

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2 Answers

There is probably a gap somewhere in the knit. The surfaces must fully enclose a volume before surface knit can generate a solid.

 
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By default SolidWorks will color an open edge as blue. It is very hard to see, so set the background/scene to be black. You'll usually see the defect right away.

 
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