There’s a variety of ways to add threaded holes ... the right size. If you try to enclose them, you have to add a manual step to your printing process, too. You can buy threaded inserts (see ...
After establishing a pull-out force on PLA using threaded inserts (205 kg) and tapped holes (163 kg), [Stefan] tested parts printed with Prusament Tough Anthracite resin. Un-threaded and tapped ...