PCO-1881 is the standard for the regular pop bottle thread.
This model is not intended to be printed, however do what you like.
It is simply a model to assist anyone with a design that they wish to screw on to a pop bottle.
It is not an exact model. I skipped on some of the difficult radii on the thread form.
Sooo, I cannot find any difference between PCO-1881-0 and PCO-1881-1.
If anyone wants CAD files exported in DWG or DXF or TurboCAD TCW, let me know and I'll set it up. There are other formats that I can export to as well.