Customized version of http://www.thingiverse.com/thing:59332

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=59332

Using the following options:

_length = 36
_sidewallThickness = 0.8
_magnetDiameter = 3.2
_rounding = 4
_height = 12
_horizontalThickness = 0.8
_width = 36
_hingeGap = 0.2
_minimumWallThickness = 0.8
_part = box
_magnetHeight = 3.2