I was hoping to do up a proper post, explaining how to use these and all that, but decided if I'm not putting things on thingiverse I should probably actually put things online. These are parametric cards for tablet weaving. You can access it on github here. Or just download the finished objects from us.
We took a couple of off-the-shelf pieces of code and mushed them together. Now we have this abomination. Opening the file in a lightbox and automatically generating the thumbnail are forthcoming. The bump bangle is from here.