On 6/01/25 10:45, discuss-request@lists.openscad.org wrote: > If anyone has the nerve to look at this, I'd be interested in > suggestions on how the features of OpenSCAD could be better > utilised. I have a very software engineering heavy approach to > tackling these things. The mathematical challenge of this intrigued me enough that I decided to have a go at this problem. I used a chord height calculation to work out the handle and scallop bits (matching tangents), and also for the upper curve. It's not quite an exact mesh when combining the upper surface with the fillets, but my eyeballing of the model suggests that it's not worth it to do the tangent matching for that as well. Seems to work with fairly high arm counts, but there's a bit of playing round needed with the scallop depth and arm width to get it looking right. See attached. Also uploaded to printables: https://www.printables.com/model/1136923-rounded-scalloped-handle Ngā mihi, -- *David Eccles* Bioinformatics Research Analyst C: +64 21 262 3223 W: www.gringene.org <www.gringene.org> Gringene Bioinformatics

Oh, nice. For sure shorter than my approach. Thank you for sharing it. Maybe on printables you want to link to my model: https://www.printables.com/model/1116311-parametric-knob-for-hex-nuts-and-allen-screws-knau Is there any idea regarding the manifold problem with the boolean difference? I uploaded another demo to github: https://github.com/trses/screw-nut-knobs/blob/boolean-glitch/analytical-solution.scad > Am 06.01.2025 um 08:35 schrieb David Eccles (gringer) via Discuss <discuss@lists.openscad.org>: > > On 6/01/25 10:45, discuss-request@lists.openscad.org wrote: >> If anyone has the nerve to look at this, I'd be interested in >> suggestions on how the features of OpenSCAD could be better >> utilised. I have a very software engineering heavy approach to >> tackling these things. > > The mathematical challenge of this intrigued me enough that I decided to > have a go at this problem. > > I used a chord height calculation to work out the handle and scallop > bits (matching tangents), and also for the upper curve. It's not quite > an exact mesh when combining the upper surface with the fillets, but my > eyeballing of the model suggests that it's not worth it to do the > tangent matching for that as well. > > Seems to work with fairly high arm counts, but there's a bit of playing > round needed with the scallop depth and arm width to get it looking right. > > See attached. Also uploaded to printables: > > https://www.printables.com/model/1136923-rounded-scalloped-handle > > Ngā mihi, > > -- > *David Eccles* > Bioinformatics Research Analyst > > C: +64 21 262 3223 > W: www.gringene.org <www.gringene.org> > > Gringene Bioinformatics<screw_nut_piecewise.scad><Screenshot_20250106_201430.png>_______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org