Customized version of http://www.thingiverse.com/thing:1118407

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=1118407

Using the following options:

l = 9
thickness = 4
notchScale = 1.5
maxWidth = 1.6
slotWidth = 1.5
totalY = 40
totalX = 50
shuttleY = 15
shuttleX = 15
centerSize = 10
minWidth = 0.8