Marble GeniusAutomatic Chain Lift - Marble Run Accessory Add-On Set for Creating Exciting Mazes, Tracks, and Races - Endless Fun, and Creativity, Experience The Thrills of Marbles Racing

First, let me mention that some reviewers may have assembled this wrong, thus posting frustration. The chain lift should be tight around the gears, without even a tiny bit of slack. I have exactly two sets of 11 of those pipe pieces from bottom boarding station (green) to the top of the exit station (white), PLUS one entrance and exit piece so the total should be 12 pieces per side.What I did: Start with the chain wrapped around both gears, but still open. Now, I lock the two end chains together while it's tightly wrapped around both gears. It feels like the link between both ends of the chain may not meet, but they will with a bit of effort (You may need to add or remove a link to accomplish this). That being said, I've had perfect runs, with a super rare occasion that a marble goes rogue. For $10.00 - color me impressed. The chain is tall enough to get fairly intricate marble run going. I also 3D Printed some extra marble "seats" to add to the chain of 6 that come with the set. Overall, super easy to put together, and another winning add-on for this Genius set

The media could not be loaded. Great pulleys and motors. Take your time and remove links as needed so that the pulleys and chains are set up straight. There is a perfect number to use and instructions don't help on that. Just keep adding or removing links to get it right. You can very easily daisy chain these and go up as high as you need to. The video shows doing this with two of them. I would need to buy another extreme marble set to go higher probably as you run out of the small pieces. When daisy chained they can get you about 4 feet off the floor.

The media could not be loaded. So, I have slowly amassed a large collection of Marble Genius (and other compatible sets) pieces. When I saw this for only $10, I bought 3. The attached video only shows ONE of the products being used so you know how much comes in a normal purchase and I just assembled as a very basic tower.The Good:+ The motors are relatively quiet.+ It works 95% of the time.+ It allow for continuous rotation of the the marbles+ The chain length is adjustable! (and it comes with 3 more links than what is needed to reach the top. (in the video, there are 3 links I left out or it would have too much slack).+ The price! $10 for a motorized lift to the top? Buy Now.The Bad:- Doesn't come with nearly enough of the little marble catchers.- Since there's tension that pulls the top piece a little bit off level/flat, it can cause the marbles to not roll out at the top and when another marbles is dropped off, it will jam and the whole chain stops moving. I wish the top piece had a much steeper drop to get those marbles moving out of the way and not stuck if the top isn't perfectly flat.- It's very finicky when it comes to marble sizes that work. If you use official Marble Genius marbles, you'll be fine. But I have a bunch of other marbles from various sources and if they are a little too big or small, they will jam at the top or fall out at the bottom.- The bottom loading section can get backlogged and a marble will end up on top of another marble and as one is lifted up, the other will fall out of the machine.So, my title says to buy 3, and the reason is you can form one long chain 6 ft tall if you wanted. I haven't tried that yet, so I'm not sure if the motor will be strong enough to move that much chain. But, at $10, you can definitely take the 2-3 sets and make 1-2 much taller lifts. Plus, having all of the extra little marble 'seats' is very valuable. As mentioned above, they don't come with nearly enough. I could put all the little seats from all 3 lifts and put them onto the chain of 1 lift to have it cranking out more and more marbles.When the product arrives, the chain is in a bunch of individual segments that you just snap together. I'd spaced the 'seats' to attach where each of the segments attached to one another and was a little bit surprised when the number of seats didn't match up with the number of segments. As you can see in the video, the seats are still spaced quite a bit and then there's a rather large section (nearly half the chain) where there aren't any! They need to double the number of those little seats, at least! I've since re-arranged them but I thought it was helpful to give an idea of just how few of those little seats there are. The motor can definitely manage with a bunch more seats and marbles going up the lift (since I've put all 3 lift's seats onto one chain -- not shown in video).If interested, the light-up piece that makes noise is sold here: https://www.amazon.com/gp/product/B07FXWD6FX/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Good product for kids

This fits standard marble run sets just fine! The plug going from the battery box to the motor is finicky but otherwise an all around fun toy that my son loves!!!

The kids love the chain lift when it's working, but it is hard to get working because the chain has to have sufficient tension, and that is a bit tricky to achieve with the typical plastic marble run pieces. The little plastic tabs that convey the marbles are prone to dropping the marbles if everything is not aligned perfectly. And, the marbles can get stuck at the top of the conveyer if the chain is not completely vertical, again a bit hard to achieve with the plastic marble run pieces and the the tension required on the chain. Overall, fun for everyone, if you set your expectations low and expect this to be used only infrequently, do to the challenges setting it up and keeping it running. Worth the $10 we paid for it.

I used this as a last minute resort to a failed conveyer build for a project. It worked perfectly for the moving background I needed for my diorama. It was way more easier to assemble than expected. The motor could be slightly stronger, but it’s fine for my application. My only real complaint is that the cable is always loose on one of them (I bought 2) so i continuously need to push it in tighter.

In order for the chain to move properly it has to be so tight that it causes a bend in the structure . The “columns” that hold the top part get pulled to the side and it will easily fall over.