this file is used for testing thread and bolts with 3D prints (used M3 for testing)

https://www.instructables.com/id/Bolts-Screw-Thread-Nuts-and-Heat-Insert-Into-3D-Pr/

you can see the video on youtube channel here :
https://www.youtube.com/watch?v=o-haRHOf3t8&list=PLX_GBvP24CSUi2mntFP_KhZ2DghBlfxqL