I 'punctured' the difference cylinder-issue by adding more lenght to the cylinder i am using for subtraction. (z-coord = +0.2 or so.) and then making the translate([x,y,z-0.1]) slightly larger. That way i have 0.1 unit more each side of the holes to subtract the 'skin'. -- View this message in context: http://forum.openscad.org/Cylinder-won-t-puncture-tp13469p13518.html Sent from the OpenSCAD mailing list archive at Nabble.com.