Umbrella rib tip factory - parameterized rib tips

With this OpenSCAD code you may create umbrella rib tips in a few seconds which fit best to your umbrella.
You measure some lengths and diameters and you get a customized rib tip.

The rib tip has a cone at the end of the center bore to allow for printing it without support. For me it worked better with OpenSCAD than with the thingverse customizer app.