I wanted to see if there was a happy medium in FC0.22Dev (FreeCAD_weekly-builds-36958-2024-04-23-conda-Windows-x86_64-py311), unfortunately - I could not get the UI/UX to display in a manner that is also shown in the post. This is the first thing to fix, so you can check if your issues still exist ...

Change the color in the View properties.
In 0.22 change the ShapeAppearance.

AidanofVT wrote: ↑Tue Apr 23, 2024 9:17 pm What's the right way to do this?

It is not possible to attach the section of a helix to the helix, whit produces. That would be a cyclic dependency.
You can do this with a Part helix or a shapebinder thereof before sweeping it.

derbuechsenmacher wrote: ↑Tue Apr 23, 2024 7:42 pm Thanks for offering to help.. I re-did the part (did it differently this time, which was simpler) and have no issues now...

If you have the file: It would still be interesting to know, where the problem was.

Bance wrote: ↑Tue Apr 23, 2024 7:40 pm Don't join sketches.

Exactly. And beyond this,
- from what I see, it works allright: both sketches have the same coordinate system before and after the merge;
- if you want to show us something, reduce the FreeCAD file to the bare minimum, I can't imagine that these two sketches need 1.9MB.

ProjectBP wrote: ↑Tue Apr 23, 2024 7:21 pm But it seems to me that with our opinion we can influence the results.

Isn't now the time for discussions?

3-dimensionale B-Splines gibt es in der Draft workbench. Leichter zu handhaben sind aber oft Schnittkurven von orthogonal liegenden 2D-Kurven. Das ist auch als "Wilfrieds Trick" bekannt.

Cobraschock wrote: ↑Tue Apr 23, 2024 12:45 pm Wie immer schneller

Na ja, dafür hast Du ja noch weitere sinnvolle Änderungen gemacht, z.B. alles in einen Body gepackt.

Ich gehe davon aus das dies aus ein Teil gebaut/gedruckt wird.

Wenn es das ist, was der Dateiname sagt, dann würde ich es eher nicht drucken...

The newly created object has a depth which goes into the object where it is projected on. Make a boolean cut to get it "pocketed".

In diesem Fall solltest Du den ungewünschten Teil zu Konstruktionsgeometrie machen und dann das Teil in der Part-Workbench extrudieren.