H o m e
I used 15 or 20 can’t really remember; I’m not sure it would matter much between the two. i Didn’t have my prep yet dialed in either and the connection slides and pins would not work after printing. It required a lot of sanding, so instead I used super clue to glue mine together. Also be careful with the top portion of the walls where it gets thin, I broke a few of Mine trying to use the connect pieces and forcing them together. Best of luck!