You may have to play with the .stl export tolerance a bit to get a good clean model out.

I brought them into Magics RP and it also shows open edges and it won't repair them...not all of them anyway.

Will making a fillet work?

Create Arc - Tangent >> to 2 entities

Well, a big thing I notice is you haven't shared a z2g file...really the only way someone can dig in and see what's up

Not that I am aware of...full 2024 uninstall, then re-install back to the point you can run

40 minutes ago, Colin Gilchrist said:

Yes, it was also correct almost 5 years ago, when this thread was started.

Spammer Colin

Look in the quote,  hidden link under Run3

Just now, amw said:

If I reduce the number of teeth yes it will do 2 passes, but starts with the bottom which is useless in my case. Same problem as the original poster had here over 10 years ago. 

Check out my sample file above

14 minutes ago, amw said:

Still no way to do this properly in 2024? 

What threadmill?   You have been able to do it for a couple decades...

Reduce your number of teeth...though I would suggest using multiple stepovers instead...

Sample file - Bottom to Top and the same tool Top to bottom

THREADMILL SAMPLE.mcam

5 minutes ago, rgrin said:

I think they all have their pros and cons and you just need to figure out which ones you prefer and which ones does the work you need it to do the best.

Unfortunately, most of these kinds of decisions are based on $$$ instead of the things you note.

17 minutes ago, bird2010 said:

Maybe you use a very good and expensive graphics card?....If you execute "Fit or Regenerate Display List" after zooming out...how will the surface look like? Can you test it? Thank you!

You're going to hate the answer but here it is....

After you scale it up and are certain you've made a good clean surface, you scale it back down and stop worrying about how it looks...the math behind the surface is correct. It will cut properly. That chord tolerance is simply how it is visualized.

Try bringing in a full model with a Chord height set that tightly  

1 hour ago, danatoem said:

here are the 3 curves for anyone who wants to give it a go. I was unable to get anything with the coons option as well. The cures are tiny. (we do micro molding here!)

3 curve surface.mcam 304.4 kB · 6 downloads

.003"  yes, definitely a size issue....scale it up 50 times...make your surface, then scale it back down

to make a Coons, the selection order

How small is that?  It looks like it's possible it's extremely small...

and what tool did you use?

Coons

Alt + C

Pick 2 lines(2 sides) and a line and an intersection point(top line & opposite intersection point)

And still no testable file

Bad choice for that function

Let's recount...

You have, by your own admission, your first programming job...

You say it's 100% a bug

and you provide an .ecam file that the vast majority of people cannot open..

I suspect it's not a bug but a usage & definition, setting issue of course though, can't tell because you provided a file that industrial users can't open.

Maybe next time before declaring a bug or something, you provide a file that others can easily open and query...that would go a long way to getting you the help you are asking for,,,,

Sorry if this all comes off as a bit harsh but at least help us help you.

1 hour ago, ikertx0 said:

Could someone help me, to see how to get started?

Sure...

Pickup phone, call reseller...hello, I would like to buy a post with these options and I'll send some sample code...

That edit is no easy lift.

2 minutes ago, gcode said:

and they sure as hell shouldn't be calling it "turnkey"

Why not?  It sounds like they stole the money, got into the car turned the key and drove the getaway car..

Wait....you mean Mastercam ISN'T malware?????

Sounds like a graphics card or driver issue

https://www.kurtworkholding.com/resources/cad-drawings/

4 hours ago, Dillon_A said:

Sorry, to clarify, are you suggesting moving the wireframe geometry that distance along the y-axis?

Yes

2D Swept

it won't resolve the resolution completely until it's done...you "might" or might not see a little improvement as it works.