The author remixed this model.
This design essentially splits the original design into two parts and incorporates a slightly altered hinge design to facilitate easier printing on a smaller bed printer. I strongly recommend that after printing part 1 and part 2, you measure the holes of the hinge, as every printer has different print tolerances. This way, you can adjust the diameters of part 3 accordingly. After fitting part3 you may want to apply a little bit of a superglue to the Ends of the hinge to prevent to slip-out if it is loose fit.