Customized version of http://www.thingiverse.com/thing:128069
Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=128069

Using the following options:
space = 0
build_plate_manual_y = 100
build_plate_manual_x = 100
build_plate_selector = 0
wall = 1.2
custom_length = 70
custom_diameter = 19
cells = 3
type = custom