I built the original with vertical shafts. I didn't have a tap and die set to chase the threads and they were very stiff. I feared breaking them.http://www.thingiverse.com/thing:2064269
So I tried his horizontal set but could not get the damn 2 half's to screw into the gears or base. http://www.thingiverse.com/thing:2123529
Looking at the model I noticed the sides had been flattened so I figured why cut it in half, should print just fine whole.
I took the 2 halves, rotated and joined them and printed them as a whole and they were perfect. could spin the gear end to end w/o jamming and screw into the jaw base w=ithout issue.
So here it is if anyone else has a problem.