Customizable Hirth Joint (CSG version) (library)

Customizable Hith Joint (CSG version) (library)
This is an improved version of
http://www.thingiverse.com/thing:387292
This improved model can start the teeth not just at the center but also at a polygon of choosable radius. Meaning one can create thin walled tube couplings that are radially self centering (Such couplings are often found in Mountainbike axles).
The interpenetration depth of the teeth can be limited with the flatlimit parameter.
## Specialised functions
hirthaxle(l,d,dbore,n,beta,delta,flatlimit)
hirthtube(l,d,dbore,n,beta,delta,flatlimit)
"axle"-postfix: all teeth converge to the center
"tube"-postfix: all teeth emerge from the polygon inscribed into the bore diameter
## Convinience functions that make the coupling printeable upside down:
supportlesshirthaxle(l,d,dbore,n,beta,delta,flatlimit)
supportlesshirthtube(l,d,dbore,n,beta,delta,flatlimit)
"supportless"-prefix: optimized for upside down supportless printability
## Full functonatlity: