Marble Machine Racer

The pieces fit precisely. Bit of a hassle to mount under the assembled marble run (don't forget to first remove the marbles!). Needs to be taken apart to replace the batteries, but that won't happen very often.
Don't forget to buy one for every model, when putting two together you need two motors.

I held off buying it for a while due to the price, but I have to admit that this really does make either the Skate Park or the Dragon Coaster even more fun. A very easy addition to either aforementioned kit, if you build the kit you can easily add the motor. Just sit back and watch the marbles do their thing without any human input.

Bought this to power the Dragon Coaster my son and I put together. It works quite well. I think changing batteries is going to be a little more of a hassle than we'd like it to be, but I don't anticipate having to do that for quite a while. The on/off switch is a little difficult to reach. Otherwise, it makes a nice addition to the Dragon Coaster. Having previously built the mini coasters which have to be turned by hand, it was fun to turn the motor on and watch the balls automatically run through the coaster.

My son loved this!!!! He is 10 years old. I did monitor the putting together of this as I can see if the pieces are glued together crooked or not correctly how the machine would not run properly and frustration will ensue. But I helped him make sure we used the 90 degree tool. As a 10 year old he was in a rush to get it done. We didn't do it over several days as the instructions say to, we did it over a few hours and it turned out great. We will purchase more of these for gifts in the future to tie together with this one.

Although you can use the various marble machines without the motor, they work much better with it. My daughter was often turning the gear the wrong way, and the marbles would get stuck. The motor is much better, and makes watching the marbles tale the path more enjoyable. One drawback, when I first placed the batteries in the holder, the motor wouldn't turn on. I noticed it was not making a good connection (the motor worked when I had the batteries in a partially removed/replaced location), a little bit of investigation with a volt meter showed one of the springs in the battery holder was not making good contact. Slight adjustment of the spring seems to have fixed the issue, and marbles are moving as desired.