Hi. I am trying to createsolid for my entire design, but I am not sure why it keeps saying unable to create soild. I tried to joinedges
but I don’t know what I’m missing here.
Sander.3dm (3.6 MB)

The main problem with your model is you have duplicate surfaces. Extract all four surfaces that aren’t joining ptoperly and delete 2 of them and join the other two back.

After joining everything you have a gap between the bottom part and the main body. You might want to use a 2 rail sweep to fill that gap.

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