Parametrized Double Ring with Luer Lock Port

Parametric tube adapter - all values in millimetres.

Functions "example1" and "example2" demonstrate the double_ring function.
"example1" includes a hole (as in a Luer Lock Port) for possible medical applications of this design.

double_ring/example2 function arguments
* od1=outer diameter #1
* od2=outer diameter #2
* id1=inner diameter #1
* id2=inner diameter #2
* h1=height of cylinder #1
* h2=height of cylinder #2
* chamfer_bottom=true|false
* chamfer_top=true|false

Double ring with Luer Lock Port (example1) parameters:
* od1=outer diameter #1
* od2=outer diameter #2
* id1=inner diameter #1
* id2=inner diameter #2
* h1=height of cylinder #1
* h2=height of cylinder #2
* chamfer_bottom=true|false
* chamfer_top=true|false
* lpod1=luer lock port outer diameter #1
* lpod2=luer lock port outer diameter #2
* lpid1=luer lock port inner diameter #1
* lpid2=luer lock port inner diameter #2
* lph1=luer lock port height of cylinder #1
* lph2=luer lock port height o