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Re: Define thread length with a linear dimension instead of a callout
@PeteYodis is this topic still being considered? It would be very useful to have it.
Re: Export to 3mf does not export the NPT thread
Technically this would violate the specifications of NPT threads because you don't want the same clearances between the crown / root of the threads as you have between the thread faces, so you need to treat them with different offsets. That's why I copy the female thread, boolean to get the negative cavity of that (which is subtly different from the male thread) and then use that as my tool in another operation to create the female thread in a new location.
Re: Export to 3mf does not export the NPT thread
You seem to have found one of the rare few parts in the mcmaster carr catalog modeled with straight threads instead of the correct NPT geometry. CAD manager must have been asleep that day. I went and pulled one from the elbows catalogue which has better thread models I've validated with my own 3d prints. The way I approach models like this is to get a single studio cooked up with the features I want to use on other models and to use it as a seed for the Point Derive custom feature so if I need to make changes to my clearances or geometry for this 3/4" NPT geometry later I just need to update the source studio and it'll force downstream updates anywhere it's used. Think of it like a geometry catalog instead of a parts catalog.