Rod Insert Hirth Joint

Video: https://vimeo.com/653031782

Customizable Hirth joint to attach on a dowel's (or a rod's) end. The design is done in two separate parts of Pin and Socket.
I imagine it could have multiple applications but I made a configurable articulated arm out of it, using a drywall screw and a compression spring, as shown in the photos.
#Customizing
The design requires [Hirth Joint Library](https://github.com/GillesBouissac/agentscad/wiki/Hirth-Joint) to be installed on OpenSCAD.
Almost everything is customizable, including nozzle's diameter, the depth of the insert, rod's diameter, axis (pin's) diameter, Hirth teeth function, number of teeth and teeth height.

**Note:** The rod insert is designed a bit loose, because I wanted to glue the dowel in the insert. If you need a tighter fit, you can reduce 0.3 mm clearance on line 24:
```
rod_d = $rod_diameter + 0.3 + $nozzle / 2.0;
```

#Disclaimer
This design is published under BSD license, therefore the users are responsible to ma