DanS wrote > The linear extrude tool is great but I'm having trouble getting it to do > one thing I want. > > Let's say you have three circles and you wish to extrude them such that C > twists around B and B twists around A. > > I can't quite see how to do that because I believe I read you can only > extrude something once (plus a second extrusion might "smear" an object > even if it were possible). > > Is there a way to do this? Quoted as it didn't make it to the mailing list. ----- 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/Any-way-to-twist-twice-before-extruding-once-tp18033p18034.html Sent from the OpenSCAD mailing list archive at Nabble.com.

You could not do it with linear_extrude which just twists around the extrusion axis. If I understand well your problem, you need a helical extrusion. If I am right, you will need some sweep operator. See https://github.com/openscad/list-comprehension-demos 2016-08-05 19:58 GMT-03:00 MichaelAtOz <oz.at.michael@gmail.com>: > DanS wrote > > The linear extrude tool is great but I'm having trouble getting it to do > > one thing I want. > > > > Let's say you have three circles and you wish to extrude them such that C > > twists around B and B twists around A. > > > > I can't quite see how to do that because I believe I read you can only > > extrude something once (plus a second extrusion might "smear" an object > > even if it were possible). > > > > Is there a way to do this? > > Quoted as it didn't make it to the mailing list. > > > > > > ----- > 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/Any- > way-to-twist-twice-before-extruding-once-tp18033p18034.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 >