Parametric Jaw Coupling with optional spider

This is a remix of modilion and zignig's jaw coupling as I wanted one without a spider and a hub for attaching to shafts with variable attachment options on either hub.
Any number of struts (=legs=teeth) can be selected rather than the 2 per hub of the parent designs.
If the coupling is created without a spider then the each hub is cut out so they mesh tightly.
The current four options for attaching the couplings are:-
1) A captured nut and bolt perpendicular to the attachment shaft (eg for a motor shaft)
2) An inline captured nut into which can be screwed the main shaft (eg a threaded rod). (I'll probably drill and pin them together, but you could also use a self-locking nut, or possibly glue them.
3) A perpendicular hole through the entire hub to allow a bolt to be passed through (good for tubes which would be crushed by 1.
4) A slit though the base to allow it to clamp directly onto the shaft.

You can print the spider, but I'd probably make one out of Sugru/oogoo(h