Aah, great, I can see what hull() does then, handy! Sorta like an old school RC model with heat shrink over the top then :) render() sounds good too. Always more to learn :) Thanks! Mark -------------- next part -------------- An HTML attachment was scrubbed... URL: http://rocklinux.net/pipermail/openscad/attachments/20120501/d7bb26ad/attachment.html