When I run this I just see a solid 6x6x6 inch cube. Why is it not hollowed out? I'm on Ubuntu 14.04 and version 2014.01.29 (from the ppa). itomm = 25.4; // conversion factor from inches to mm length = 6 * itomm; // x width = 6 * itomm; // y height = 6 * itomm; // z thickness = .35 * itomm; // thickness of the walls module hollow_box(xlen, ylen, zlen, thikness) { difference() { cube([xlen, ylen, zlen]); translate([thikness, thikness, thikness]) { cube(xlen-2*thikness, ylen-2*thikness, zlen+100); } } } hollow_box(length, width, height, thickness); // x, y, z -- View this message in context: http://forum.openscad.org/Can-t-get-difference-to-work-tp17218.html Sent from the OpenSCAD mailing list archive at Nabble.com.

You forgot the brackets [] in the second cube statement > -----Original Message----- > From: Discuss [mailto:discuss-bounces@lists.openscad.org] On Behalf Of > lmcc > Sent: Thursday, April 28, 2016 8:49 PM > To: discuss@lists.openscad.org > Subject: [OpenSCAD] Can't get difference() to work > > When I run this I just see a solid 6x6x6 inch cube. Why is it not > hollowed out? > I'm on Ubuntu 14.04 and version 2014.01.29 (from the ppa). > > itomm = 25.4; // conversion factor from inches to mm > > length = 6 * itomm; // x > width = 6 * itomm; // y > height = 6 * itomm; // z > thickness = .35 * itomm; // thickness of the walls > > > module hollow_box(xlen, ylen, zlen, thikness) { > difference() { > cube([xlen, ylen, zlen]); > translate([thikness, thikness, thikness]) { > cube(xlen-2*thikness, ylen-2*thikness, zlen+100); > } > } > } > > hollow_box(length, width, height, thickness); // x, y, z > > > > > > -- > View this message in context: http://forum.openscad.org/Can-t-get- > difference-to-work-tp17218.html > Sent from the OpenSCAD mailing list archive at Nabble.com. > > _______________________________________________ > OpenSCAD mailing list > Discuss@lists.openscad.org > http://lists.openscad.org/mailman/listinfo/discuss_lists.openscad.org

Thank you. It works now. -- View this message in context: http://forum.openscad.org/Can-t-get-difference-to-work-tp17218p17220.html Sent from the OpenSCAD mailing list archive at Nabble.com.