Mantis Fanduct 56mm Wide with Hex Holes

Original 56mm fan duct did not have hex nut holes on the flange because there wasn't enough room/material to add them. In order to maintain flange integrity and strength, the new hex holes were only inserted 50% of their normal depth and will cause the hex nut to protrude slightly and stick out half way.

Used M3 x 16 to screw it together, and tweezers to place nut.

Added M3 nut hex holes to flange at 50% hex depth.