[BBray_T1296]

In the past I have printed a slightly undersized hole then drilled it to a tight tap diameter, then used machine screws to force threads into it. Alternatively,you can design a part with a hexagonal cavity, pause the print and insert a nut, then allow the printer to seal it inside. Both options have been successful to me when building H class rockets subject to large ejection charges. I print the nosecones and electronics bays and fasten eyebolts to tie the parachute onto these parts. Everything gets blown out of the top of the rocket body and then arrested by a shock cord. Never had an issue with threads pulling loose