Customized version of http://www.thingiverse.com/thing:128069

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

Now the channels are too wide. Try round 3.

Using the following options:

space = 1.5
build_plate_manual_y = 100
build_plate_manual_x = 100
cells = 6
custom_diameter = 20
build_plate_selector = 0
custom_length = 3.2
type = AA
wall = 2.0