Okay, my first post to this forum. So let me say hi first. :)

I have a question concerning the creation of solids from surfaces. I usually create more complex solids by sweeping curves along shared rails. For some reason gluing the surfaces together afterwards using boolean operations often doesnt result in solids even tho i can't spot any holes. Am I possibly doing anything fundamentally wrong? The boolean command works so its not like the surfaces dont intersect or anything like that. (Well they dont really intersect i suppose, they just touch each other because of the shared edges.)