I thought our Dummy needed a more shaped booty to go along with his shoulder blades.
As you see in the picture now at least his jeans have a pair of pockets. Nothing too kardashian.
But damn now it looks waaaay better!

The square bore also it's been resized to match the one on the upper back, which is used as joint in many display systems.

(Now the hole is 4,8x4,8 mm and the chamfer is 0,7 mm if u're interested, since the chamfers on the frame parts are almost all 0,75 mm.
This quotes and the file are at 150% scale which I believe to be the smallest that makes sense with a 0.4 nozzle.
Yes I reverse engineered a lot this subject. Daaamn he's made so good!)

Hope u like it! :)

H-