Customized version of https://www.thingiverse.com/thing:5983067

Created with Customizer! https://www.thingiverse.com/apps/customizer/run?thing_id=5983067

Using the following options:

outSideLength = 50
outSideWidth = 70
outSideHeight = 45
fillHeight = 0
shellThickness = 3
ribThickness = 7
filletRadius = 4
splitFactorPercent = 75
showBox = 1
showBoxTop = 1
showBoxBottom = 1
showBoxCombined = 0