Here's why you work so hard (see yesterday's post) to get a reliable print at 50% size: Because you need a lot of them! Young C has been spending a lot of time playing Pokemon at the Brooklyn Strategist (one of the best places on earth!) and will be bringing these to the next tournament:
Thingiverse link: http://www.thingiverse.com/make:89385
Settings: Printed four at a time on an Afinia H-Series with .3mm layer height.