Welcome to the forum. Your post is still flagged as "This post has NOT been accepted by the mailing list yet", so nobody gets it unless they look. You need to subscribe to the mailing list <http://forum.openscad.org/mailing_list/MailingListOptions.jtp?forum=1> , and respond to the registration email. Eric Buijs wrote > Hi, while doing a simple tutorial I encountered a possible bug in > OpenScad's renderer. > Below is the code. The outer cube should have a circular holes on every > side of the cube but after pressing F6 some of the holes aren't fully > circular (the preview mode is ok). Even worse the stl file has the same > mistake. Any idea what causes this problem? > > difference() > { > cube([90,90,90], center =true); > union() > { > cube([80,80,80], center =true); > cylinder(r = 27.5, h = 90, center = true); > rotate([90,0,0]) cylinder(r = 27.5, h = 90, center = true); > rotate([0,90,0]) cylinder(r = 27.5, h = 90, center = true); > } > } <http://forum.openscad.org/file/n16396/cube.jpg> > > P.S: I work in OSX (10.10.5), OpenScad 2015.03-03 ----- Admin - PM me if you need anything, or if I've done something stupid... Unless specifically shown otherwise above, my contribution is in the Public Domain; to the extent possible under law, I have waived all copyright and related or neighbouring rights to this work. Obviously inclusion of works of previous authors is not included in the above. The TPP is no simple “trade agreement.” Fight it! http://www.ourfairdeal.org/ time is running out! -- View this message in context: http://forum.openscad.org/Bug-in-OpenScad-rendering-tp16396p16397.html Sent from the OpenSCAD mailing list archive at Nabble.com.