Comment by Arcuru

> If anything, the extra material for the case would be the perimeter length times the perimeter wall width times the height

That's what they did?

Perimeter length = 2*335mm + 2*235mm

Wall height diff = 2mm

Wall width = 1mm

(2*335 + 2*235) * 2mm * 1mm = 2,280 mm^3