@ Michael Why trim the middle little part?
Seems that works without it! If each curve has no overlap itself... :)



@ Burr thx! :)

@ Ed : nice one!

Hi Pilou, I didn't trim there, that was a blend curve I put in since I sketched the pretzel instead of making it out of control points with alignment.

- Michael

Ok because that was writed "break" at these points! :)

Hi Pilou,

re:
> Ok because that was writed "break" at these points! :)

Yes, with the original description of it being one long unbroken curve, that case would need a break in that spot.

- Michael

Thanks Michael -

Yes, that does work and I remade my model as below.

I first performed a Mutual Trim on my curve, took a short section shown in green, Mirrored it, Copied, and Joined to make the longer green & red chain. Then I performed a Sweep on each colored section and Boolean Union into a solid. Then I Flowed the design around the ring and Boolean Diff.

I made no attempt to match up the ends, as they are on the bottom of the ring, and this model is for rendering, not mfg. When I make the ring on a rotary table on the milling machine, the ball-nose cutter follows long continuous curves to produce the grooves. These curves match up on the ends for a seamless design.

Thanks again Michael, BurrMan & Pilou. I'll be making similar designs in the future and now I have a process for making the models.

Ed Ferguson

that's an awesome design. someone is going to be a very happy ring owner.