openscad / MCAD

The comments on file fasteners/threads.scad claim 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.

MCAD/fasteners/threads.scad

Lines 46 to 50 in 6ccd869

    
           // ---------------------------------------------------------------------------- 
        
           // internal - true = clearances for internal thread (e.g., a nut). 
        
           //            false = clearances for external thread (e.g., a bolt). 
        
           //            (Internal threads should be "cut out" from a solid using 
        
           //            difference()).

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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	// ----------------------------------------------------------------------------
	// internal - true = clearances for internal thread (e.g., a nut).
	// false = clearances for external thread (e.g., a bolt).
	// (Internal threads should be "cut out" from a solid using
	// difference()).

[dev] Identical male and female threads generated