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that is a good idea. I did not think of that. I have had to print modelled threads for work. I have even modelled a plug for a tapered pipe thread that I can place on a model and combine cut bodies with to make a pipe thread fitting. however, when I printed it out I did need to chase the tread with a tap but it made for a very smooth thread after chasing with the tap. It looked like it was a machined thread.

I have attached the 1/2-14 NPT model I use to make the threads. The threads should work ok if need to but it does require tapping to make them good to a thread gauge.