Try to form solid not creating a solid
I have created a surface model and am trying to turn it into one solid piece. When using the surface knit tool I can select try to form solid and Solidworks does not give me any errors, but when I look at the cross section, the model is still a shell. Also, The thicken tool is greyed out. Does anyone know why this might be happening or are there any suggestions on better methods of turning surfaced into solids?