ROKR Mechanical Gears DIY Building Kit Mechanical Model Construction Kit with Balls for Teens and Adults Tower Coaster

Very detailed work, the quality is great and the the build is fun

I haven't done one of these before and thought I would try it. At first it looks like a daunting task, specially when you see all the pieces. I admit it was fun putting it together, but here are some things to keep in mind. The instructions rely heavily on you paying close attention to the details as one piece can easily be installed backwards if you don't look careful. Cutting the pieces out from the stencil requires some care. I strongly suggest you cut out a few of the larger pieces to get some practice. The hardest part for me was snapping the pieces out careful enough so you don't break them. Make sure you take you take your time taking them out as they get damaged very easily. The pieces don't really snap into place, you have to push them into place and judge that they've gone far enough. You'll need sand paper for sure, I bought some extra, which I used to lightly sand some of the edges off from the connecting pieces. I found sometimes some of the pieces didn't want to "snap" in so a little sanding let the pieces slide in nicely. Just be careful as you can end up with a piece that's too loose. Finally... keep in mind that this is a patience game. You must have patience or you'll get frustrated and could easily break a piece. Overall, the whole process was fun, a little stressful sometimes, but definitely satisfying when it was all complete and worked!. I will buy another one... but I might just have to wait a bit before I decide to commit myself to going thru that process again. I have large hands and can be a bit challenging working with small pieces. As you can see from the pictures, the Quality of the product is GREAT! ... it's important to have good quality on these types of puzzles, or they just won't work well when you put them together.

well engineered and fun for those that haven't seen it work

This is an amazing kit. My 12 year old grandson and I worked on it together. The quality of the product is very good. Pieces are precisely cut and fit together very well. Instructions are pictures and pretty easy to follow. Very important to follow them in order. Marble run works great!! He loved it! Took about 6 hours!

I read up on the top reviews on this before purchasing and have no idea where they are coming from. The instructions are extremely easy to follow and not sure how much clearer they could be. They even include scannable links to see how moving parts should work. If you have any experience with lego you will find this better than those instructions. As for the time spent i would say all in i was around 3.5 to 4 hours. REALLY cool craft/puzzle, enjoyed every minute and now the kids love watching it go.

This will most likely be as nice as the last piece he built. Just needs to put the tablet down & build it.