Mason Jar Port Tube

mason_jar_port_tube.js

function main() { 
    return union(
        // The tube
        difference(
            cylinder({r:16, h:28, fn:100}),
            cylinder({r:15, h:28, fn:100})
        ),
        // The flange
        difference(
            cylinder({r:20, h:2, fn:100}),
            cylinder({r:16, h:2, fn:100})
        )
    );
}