I could be talked into it but my nozzle clogged last night so am out of business until then. Brook stated somewhere that repeatability was 0.1 - 0.2mm and this sounds right from what I've seen on the prints I've made so far.

BTW, Brook is a really nice guy and very accessible. I'm sure he would be very interested in your repeatability measurements and may even contribute to the cause. If you don't know the Printrbot story take a look. He did a 25K kickstarter a few years ago that turned into over 800K. He has done nothing but design newer and better printers since then and still sticks to the open source philosophy. It looks like he is selling over 50 of the printrbot metal simples a day now.