I like to have my e-ticket as a finger ring but could not find my size on sale, so I designed this container to make a finger ring from a bracelet (not speaking that bracelet is less expensive). Naturally this could be adapted to hold any other similar chip.
I started from a compound three pieces design but at the end I like monolithic single piece design better (though it takes several attempts to get the right inner dimensions of the container). Minimalistic design without smooth transition between container and ring was done by mistake but it seems to be workable (not speaking that it renders much faster) so I publish it as well.
Be warned that the first compound design has extra free space below the container so you will probably want smaller ring diameter than found with the tester ring.
I am quite doubtful if STL files could be of any use, I guess you will have to regenerate them for your own ring size (and inscription and may be chip size) nevertheless here they are.
I do not really like the way scripts are currently written and it would be good idea to rewrite them more systematic way, however, they do what I need.
Note that 'mono' script does not refer 'common' script - all definitions are inside - but it does use 'bezel' script to calculate side walls inclination.
Update 7/23: add asymmetric design.
Update 7/28: yet more asymmetric and slower to render design. It took me several attempts to find proper dimensions and make it really handy.