Short summary: Amazingly durable device that is pleasing to the eye. The gathering will be long, but patience will bear fruit. I'm a big fan of creating devices and gadgets that you can see in action before your eyes. This ROKR 3D Wooden Puzzle Mechanical Model Wooden Craft Kit is a perfect crafting kit for kids and adults to own and enjoy. It is entirely hand operated (no batteries). So when properly assembled you can watch this contraption at work as you crank the winch. The entire assembly is made of wood and the material is strong and measures approximately 8" x 9". Unfortunately I broke a part during assembly, but it was a tiny piece the size of a grain of rice and luckily they have a lot of spares; Probably it is assumed that users could damage this part. So having add-ons is better than just a part. It took a really long time to assemble and it gets quite tedious with tiny parts, especially when installing many tiny parts. They provide everything you need and you don't need your own tools to create this. They also offer some wax as a lubricant in some parts of the gearbox to keep it running smoothly, as well as a piece of sandpaper to gently rub off any splinters, which helps. In general, your nails will hurt a little, but once you're done with it, it's worth it. Once complete, this contraption was a breeze to start and a joy to watch the balls run over and over again. Depending on how you build you might sometimes find that the ball stops, but just adjust the part that is not positioned correctly and this will solve the problem with no problem. After a few minutes of operation, nothing has broken and it is the perfect spectacle for the visitors. An interesting feature of this game is that there are actually multiple paths that the balls can take, so the ball changes every time it passes. Perfect gift for you or your builder family.
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