Review on Marble Genius Automatic Chain Lift by Ben Olson

First let me mention that some reviewers may have put it together wrong which was disappointing. The chain hoist should fit snugly against the gears with no play. I have exactly two sets of 11 of these tubes from the bottom entry station (green) to the top of the exit station (white), PLUS an inlet and an outlet, so there should be 12 total on each side. What I did: Started with a chain wrapped around both cogs but still open. Now I connect the two end chains together until they wrap tightly around both gears. It feels like the link between the two ends of the chain might not meet, but it will with a little effort (this may require adding or removing a link). Other than that, I've had perfect runs, on the very rare occasion that a ball misses. For $10 - the color won me over. The chain is high enough to guide a fairly difficult marble walkway. I also 3D printed some extra marble "seats" to add to the 6 piece chain that comes with the set. Overall very easy to assemble and another successful addition to this Genius set.