Looks like a fun website to spend a hour or two. Thanks! Regarding tolerances, your OPs article states that they were actually able to produce them before, but

Looks like a fun website to spend a hour or two. Thanks! Regarding tolerances, your OPs article states that they were actually able to produce them before, but not at a satisfying quality. I don't know what a 'good enough' quality is, though. It's a good story nevertheless :)