Customizable Spinning Wheel Bobbin

After designing a couple of bobbins in Tinkercad...
https://www.thingiverse.com/thing:2579262
https://www.thingiverse.com/thing:2528103
... I realized that it would be fairly easy to make an OpenSCAD customizer for spinning wheel bobbins so that you just enter some parameters and it produces the parts required to make the bobbin. As with the Tinkercad designs, the parts are in a modular format that fit together fairly snugly and are easy to print.
If supports are required, they're very small/simple and they're always on an inside face. And much of the time you can just print the piece upside-down to avoid the need for supports.

The default parameters are for a Schacht standard bobbin. If that is what you want, you can go to the Thing I created here:
https://www.thingiverse.com/thing:2586323
I've also used this to make a customized Majacraft standard bobbin, which you can find here:
https://www.thingiverse.com/thing:2586421
You can find the specific parameters for those bobbins in the individual Thing details, but I also give some custom parameters for various bobbins later in this Thing's description.