lazy-union isn't in a release yet, you'll find it in the nightly dev installs further down the download page. So you know, integral meshes aren't necessarily what some folk, particularly 3D printers, need.  All that's required in the slicers is for a particular XYZ coordinate to be set to "1" in the slice layer is to test within at least one object.  For scale modeling, I'm modeling individual parts of a steam locomotive and then integrating them in Windows 3DBuilder by just embedding the parts within each other by a little bit.  Here's a post on that particular endeavor, replete with a failure based on missing the embed: https://glenn.pulpitrock.net/blog/posts/2022-09-01_168_decorations_pt2/ If I were modeling to support something like finite-element analysis I'd be more concerned about your angst.  But, I'm not... On 6/7/2023 11:56 AM, neri-engineering via Discuss wrote: > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org