About this 3D model

Just like the original but this one has two mounting holes for the revision B and onwards Raspberry Pi boards. The holes are 2.8mm in diameter which is sufficient for a M3 (3mm) bolt to self-tap a thread. I used two M3x8 hex headed bolts. The holes on the Raspberry Pi are 2.9mm in diameter, I drilled mine out to 3mm carefully with a drill bit.