Customized version of http://www.thingiverse.com/thing:2186853

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=2186853

Using the following options:

bevel_radius = 1.6
margin = 0.1
shelf_radius = 1.2
box_length = 50
shelf_height = 1.2
wall = 1.8
inset = 0.8
$fn = 96
cylinder_radius = 20
box_height = 10
bevel_height = 1.6
fudge = 0