Mechanical Marble Run V4

Revisions for V2: An issue with the base having a wall at the bottom of the small gear elevator has been fixed.
Revisions for V3: An issue with the base marble channel being too narrow has been fixed and the transfer gears, transfer rod, and transfer cap have been changed to have a cross shape over the circle. 
Revisions for V4: An issue with the base where the center circular drop was not wide enough for marbles has been fixed.

Supports should not be needed-unable to confirm.

Gear groups from largest to smallest: Large Gear Elevator, Small Gear Elevator, Crank Gear, Transfer Gears.

Orientation of the gears matter.  They have larger slots on the output side while smaller slots on the input side.