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Hey Community of AC, i've been working on my thesis, im creating pieces of 3d to hold a servomotor, and ill print it on a 3d printer, will be my first time and i dont want any mistakes since it cost some money, so while creating the piece i've been using a lot of Union-Extrude-Presspulls but using the P-P i've encountered with some lines that bothers me and makes no sense.. it seems like is 2 blocks united but it is not. ist just marks the line whenever i do the P-P, i have attach the picture so you can help me, what i want to know if i should ignore it, and it wont print 2 pieces instead of one, i tried removing the whole separated part, created a new box bigger than that one then i united and the same exact lines appears.. Another thing before i print, is there an option that shows me if its a space between 2 pieces, for example if 2 pieces are united and it has like 0.000001mm of space between them the 3d printer will print 1 piece but ill separate in 2 when you use some force.. i deff dont want that to happen to me. I want to be sure that the entire piece is in one piece.. can i see that with an option? Sorry for bad english, i Attached the picture with the problems of the line and the entire Drawing so you can see for yourself. Thanks in advance. para forum.dwg