Customized version of http://www.thingiverse.com/thing:2191384

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=2191384

Using the following options:

build_plate_selector = 0
black_min = 0.1
black_threshold = 0.1
build_plate_manual_y = 100
build_plate_manual_x = 100
white_max = 0.6
corner_cutoff = 0.9
white_threshold = 1