ROKR3D Wooden Puzzles for Adult, Marble Run Puzzle Model Mechanical Marble Run Building Kits DIY Toy Hobbies for Adults for Men, Women

I had a lot of fun putting this model together. Definitely not for young kids as it requires a delicate touch when separating pieces from the template, and some dexterity is needed during assembly. Instructions were very clear but some images were too small and hard to see without a magnifying glass. Overall, a great product if you take your time with it.

First of all, I have put together many of these types of models/puzzles and they are always a great distraction to the real world and give me something to do with my hands. I thought this was very much on-par with other brands I have done and am pleasantly impressed with how well it both looks and works! It will sit nicely with the other interactive types of these puzzles that I have put together.Now, I need to make a comment: to those who complain that there are parts that break easily: this is a MODEL, made out of less than 1/8-inch plywood. It's not made of steel or ceramic or carbon fiber. Yes, there are delicate pieces, just like in ANY model, so don't blame the manufacturer! It's equivalent to dropping a wine glass on the floor and then blaming the folks who made it. Don't be a dummy, YOU broke it, not them.The box has this version marked as "advanced" skill level, and I will agree. If you have not assembled one of these before, go with a smaller, more simple kit. Get to know how these things work, what tools you may need and how to work with (and repair) parts. While I have done many of these, inevitably I end up breaking a piece... even as methodical, deliberate and careful as I am. This isn't a starter.The instructions call for waxing the gears to aid in smooth operation, but I have learned that using wax is a great assembly tool too... if there are parts that take a bit of force to fit together, lubricate both parts where they connect with some wax and they will slide together perfectly.

More fun assembling than using, but a fun toy all around. Be very, very careful assembling, as pieces break easily. I found the use of a small pointy nosed pliers and a dab of superglue here and there very helpful. Be very careful to follow the assembly instructions!

Very interesting

Laser cut, seems accurate to at least a quarter millimeter, so all of the friction parts fit fair and snug. Also comes off the sprue easily, although I did break a couple spare parts and there were a few chips in the wood, especially around railings. Said railings also come loose in a couple places, but super glue fixes all of it. Pay extra attention to when/how many/color plastic bushings you put on the rods, they are a nightmare to remove. Also recommend buying an extra bag of 11mm steel bearings. The ten it comes with aren't enough to keep it running non-stop, so you spend half the time waiting for them to climb up. The flappy bit up top is a bit loose, but I think that's on purpose to give more jiggle to it. A certain pair of 'T' shaped parts go between plastic; find them on the box as soon as you make them and keep an eye out.Also took all day to build. They say it takes 8 hours or so, and they mean it. Could have shaved a couple hours with prep work and more room, but it's definitely a long job. No friends made along the way.