However that's not true and the clearance defined is not used to generate the profiles. Therefore the two threads, male and female, are generated identically and are therefore unable to fit one into the other if printed as is.
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The comments on file
fasteners/threads.scadclaim a difference will be made between external and internal threads, so different clearances will be applied to be able to fit male with female threads. https://github.com/openscad/MCAD/blob/6ccd869e92e8b7644bc4ede24d6fe62c37a7eb3e/fasteners/threads.scad#L46-L50However that's not true and the clearance defined is not used to generate the profiles. Therefore the two threads, male and female, are generated identically and are therefore unable to fit one into the other if printed as is.