
One could resort to designing matching slots in each piece or even glue, but those approaches don’t result in anything particularly strong. If you need a robust attachment for your design, what should you do? Can you use screws?
Yes, you can simply drill a hole of appropriate size, but can you actually have screw threads in your 3D print? The answer is yes, according to Stratasys, who published a list of techniques for including screw threads in your design and print. They include the obvious (tap and drill) tp the less obvious (employ heli-coil inserts).
If you’re seeking a way to screw your print, check out their ideas.
Via Stratasys