ROKR 3D Puzzles for Adults, Electric Model Kits Marble Spaceport LGC01, 472pcs Marble Run Brain Teaser Wooden Puzzles Building Toy, Desk Decor Creative Birthday Gifts for Men/Women 14+

This was my first wood puzzle kit that I have assembled. I was amazed at how precisely all the pieces assembled. The pieces were easy to remove from the boards, and for the most part easy to fit into place. I can tell you that I did not break even one piece of the puzzle during assembly. They do provide extra pieces of many smaller parts, just in case you need them. I did take the advice of other builders and work on top of a towel. Should you then drop a small piece it wouldn't bounce away. The other good advice is to sand all parts to smooth the edges. Also, use plenty of wax when instructed to do so. It seems like a small piece of wax that they give you, but it is plenty large enough to apply it liberally. The puzzle will have to sit level to work correctly. Once level, only small adjustments were made to have it working smoothly.It was a very enjoyable build. I am sure to purchase another!

Lots of fun to build.

I gave two of these as gifts last Christmas. One to my brilliant scientist sister, and one to my doctor's 8th grade son. Both of them were so taken with it they tackled it the first day, and I've seen it running at my sister's. One surprise is that there are alternate paths the balls can follow. I didn't have time to see if that is somehow randomized or a pattern, but it adds even more visual interest. Both said it got a little fiddly at times, but such is model building.

Who ever designed this thing was a genius. The attention to detail and the precise cutting of all the pieces is astounding! I am very impressed. Everything punches out well and fits exactly as indicated in the assembly manual. They even supply you with three specialized tools that you assemble, one of which is entirely necessary and it would be very difficult to build the machine without. They also supply two small screwdrivers to attach the tiny screws that are needed here and there. It looks daunting at first but the guide walks you through each step with clean, detailed illustrations. The only issues are the ones that come from not paying close attention to the call-outs on the pages. It took me 4 days to assemble generally doing two sessions a day (if you work too long at any one given time you are likely to get a real strain on your neck from hanging your head so long (at least I would). So, I worked a while in the morning and then again late in the afternoon. So, after all the care and attention I used to assemble this together it was a shame it didn't fully work when I was done. I can't say it was the kit's fault or some tiny angle I didn't get right. It does work but some of the little "tricks" on the various paths don't always work right and the balls just stop or don't follow the path. I've looked and can't figure out why. But, it still works well enough to show to friends and have them marvel at my creative prowess.A few tips should you tackle this beast.1. Take your time.2. DO NOT punch everything out at once!3. Take each stage as a separate "puzzle" - punch and gather just what is called for and then complete that part before moving to the next.4. I sanded every burr off of each piece whether called for or not. But be careful as some pieces have little nubs that could easily be sanded away.5. There is plenty of wax to coat gears and other sliding surfaces so be thorough.6. There are a LOT of extra parts (see image). But I can say that I never had a single piece break.7. When the instructions call out to "check orientation" of a piece - check it three times. One of the mistakes I made a few times.8. It is much easier in the beginning as putting the large assemblies together can be tricky. Use the screwdrivers to gently nudge a piece you can't get your fingers to.9. Make sure that when you get the crank attached that each part is spinning smoothly as they are added.10. HAVE FUN - it's not a race.

This is my second model purchased from this company for my husband. He's a mech engineer so he likes working on these, no problem with the first. There is a defective or missing part for this one and we have notified the seller but no response. Since it is past the Amazon return date so we have to deal with the seller. I may change the rating if the seller provides what we need. Received new part.

Great 3 dimensional wooden puzzle. My granddaughter loves this. Purchased the Space Port marble run and Romantic Notes wall clock as next challenges.Fun and challenging, be careful to read directions a few times as it is neccessary to follow them. I did braek a few parts, but ROKR came through with low $$ replacement parts. Great support!

I am putting this together with a 9 year old. They would not be able to do this on their own -- but we knew that going into the purchase. It's really fun to put together as a team -- they do what they can (which is quite a lot), while I do the fiddly bits like removing the delicate pieces from their mold, managing the teensy little washers that hold the axels together and quality assurance/troubleshooting for assemblies.Quality of the pieces is really high. Instructions are great. And so far, assemblies seem to work, and do what they do in really clever ways. Sometimes an assembly will feel flimsy, and then the next piece will add the missing rigidity. I feel like I'm in good hands with the designer of this toy.This is going to take you HOURS, btw. I'd say we're 8 hours and about halfway through the instructions. (And we're already talking about getting the kit that connects to this one for Christmas).Honestly, this is more than a kid can manage on their own, they would be frustrated. Kiwico and Crunch Labs have much better options for the youngers. But the joy of doing something that initially feels dauntingly hard and seeing it all come together into a beautiful, working object is something potent worth sharing, and this isn't something we would get out of a simpler toy.

Very nice product, very fast shipment! A+ sellers. Perfect for busy hands