This is Hellboy's “Good Samaritan” gun from the first Hellboy movie. It is drawn at a scale of 1000:1 to avoid clipping issues (i.e. metres instead of mm). It is split into many parts, which have been hollowed out so they are all suitable for 3D printing at somewhere like Shapeways. However, because the size (in mm of course!) it would cost around £250 to get it printed (obviously all the parts need to be pulled apart and arranged for the printing process). The locking lever works, which allows the gun to open, the cylinder rotates and the bullets are removable.
PLEASE RATE THIS MODEL. THANKS.
UPDATE: Simplified some parts, added exit holes for unused 3D printing material, added rifling to barrel.