Customized version of http://www.thingiverse.com/thing:1744692

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1744692

Using the following options:

ckit_squares = true
right_edge = false
back_edge = false
edge = 12.5
hollow = true
braces = 0
front_edge = true
square_basis = 25
paperclip_wire_hole = 0
left_edge = true
magnet_hole = 5.5
y = 2
x = 2
filament_wire_hole = 0