Twisted band

It's based on the `path_extrude` module of [my library](https://github.com/JustinSDK/dotSCAD). I used a rectangle shape here; however, the 2D shape can be any shape.

There's an easier way to create twisted bands.

include ;
include ;
include ;
include ;

shape_pts = [
[-2, -10],
[-2, 10],
[2, 10],
[2, -10]
];

ring_extrude(shape_pts, radius = 50, twist = 180);


If you're interested in the `ring_extrude` module, take a look at [ring_extrude](https://openhome.cc/eGossip/OpenSCAD/lib-ring_extrude.html).