ROKR Marble Run Model Building Kit, 3D Puzzles for Adults, DIY Miniature Kit, Ideal Gift for Men and Women

The Lost City marble run set from ROKR / Robotime is an awesome USB-C powered tabletop or desktop set piece. It's perfect for those who love marble runs, as I do. From my assessment, all of the ABS parts are good quality and you can tell ROKR puts a lot of effort into its manufacturing process. When seated properly within the case, the marble channels deliver smooth and seamless travel.Operationally, it's not particularly quiet by any means but I personally enjoy the click-clack sounds of marbles rising and falling. Currently I only own the Lost City but plan to buy the other expansion kits for more exciting action. In my opinion, The Lost City's art design makes it suitable to place underneath The Future City kit, which gives the set the effect that marbles are traveling downward on journey to the lower seedier depths of a futuristic megalopolis.Regarding the internal lighting, it is pretty to look at and makes me feel like I'm looking at a pinball or Japanese Pachinko machine. However, I would suggest that ROKR add one more set of lights for the bottom of the case as there are areas in the design which appear as though they should be illuminated but aren't, such as the red and blue traffic signal and the spinner wheel toward the bottom of the track. Since the red and blue pieces are made from colored transparent ABS, it initially appears as though they are going to be part of the illuminated aspects of the kit. In reality they're just colored plastic parts with no functionality aside from aesthetics.The only real issue I had with the build process was with the instructions for the marble elevator. The instructions for that component are contained within a separate pamphlet and I feel they could have just added them to the main instruction manual instead. When you unfold the lift instructions, it takes up a lot of room in your workspace and can cause issues trying to follow the steps in a linear fashion due to the layout.TIPS FOR NEW BUILDERS!IMPORTANT: Regarding the marble elevator, I feel some of the malfunctions that others have had with the operation of this component are likely due to mis-alignments or pieces that are not securely connected. You MUST keep the set pins inserted until you have placed the main lift arms in place using the grooves as your guide. It specifies this in the instructions, so don't overlook this important tip. Make sure you don't remove them before you finish installing all the parts per the guide or your lift will not align properly. The setting pins hold the elevator gears in position to properly align the bars which lift the marbles to the top.ALSO IMPORTANT: Make sure your marble run is on a level surface when it is operational. If the box leans too far forward, marbles will pile up within the top of the feeder where they enter into the play area causing a jam. Both the front ABS case window panel and the elevator panel are removable for internal servicing in the event your marbles get stuck or somehow wind up off-track. ROKR provides a little magnet-tipped wand which makes marble retrieval a simple process.Ensure you properly trim your parts using the angled nail cutter included in the box. I was able to cleanly remove all the residual plastic tabs for smooth part edges using this tool. It's also recommended to have a good set of wire snips to cut through the tabs holding the parts for easier removal and to prevent breaking any important connection points.Otherwise, assembly is very straight-forward. If you've ever completed a plastic model kit before, or have built any Lego set, you shouldn't have much trouble following the main build guide. Get marbling!

Bought this for myself for some Christmas build entertainment.This kit is the most well-engineered kit I've ever run into, down to the parts bags, most of which have perforated zip-opening. All tools needed are included, and building the main unit went very smoothly, with excellent instructions.Instructions for the ball lifter were a different matter - it took me two tries to get it assembled properly. The main difference is that they switched from a build booklet in the case of the main unit, to a large single sheet for the lifter, which made it much easier to miss steps, as the steps were poorly-organized compared to the steps for the main unit.For the manufacturer, I'd suggest either including the lifter instructions in the main booklet (organized the same way), or printing a separate, smaller booklet for the lifter, so that the sequence of steps can't easily be screwed-up.Also kind of missing are decent operating instructions. It may not be obvious to some that there is a touch switch on the front, and why are there two USB-C ports on the back?Anyway, it was a fun build, and the engineering that went into this kit is impressive.

This is the 4th ROKR kit I have assembled. The three previous were wood marble runs and this was the first all plastic one I assembled using layout "A". The following is what I found about this kit:1. Impeccable instructions that show you each building step in detail.2. All parts are in clearly marked plastic bags with easy to remove perforations at the top of each bag.3. Electronics were easy to install with LED strings having plenty of length to make connections to the motherboard simple.4. All parts fit perfectly into where they need to go each step of the way.NOTES: A) The only challenge as mentioned in other reviews is the ball elevator (Ball Lift). I tried assembling and disassembling the elevator several times till I noticed in Step 3{2} and Step 3{3} that each side of the lift has to be aligned with the mark on the center of the tower and the mark on each lift. Once I put the parts in the correct location, all worked perfectly. B) Balls would jump over part E4 once I completed the assembly so I put a small piece of plastic on the right side of the part (looking at the finished slide-in assembly) and the balls stopped jumping out of the raceway. C) It would be nice if ROKR would include a step to check all light circuit boards prior to assembly. Although I had no issues, there could be and checking prior to assembly would make ordering a defective part easier on the onset.

The marble run took a couple days/a few hours to build, the instruction is easy to follow. Some parts are easy to build, there are some extra parts but not the ones we needed. There are different designs to build, if you buy more than 1, they can be combined. Overall, it is fun to build and fun to play. It come with a short usb C to USB C cable as it is powered by USB C.

This kit was great fun to build and the final product is impressive. The worst part is the “elevator” marble lift which is a must have but very difficult to get going. I took it apart and built it repeatedly four times before it would work, but finally got it done. The worst thing about the kit is that it’s powered by a usb adapter and has to be plugged in. A double a battery pack would be much better and you could display it on a bookshelf. All in all, expensive but worth it.

Took about 3 hours to assemble and amazing design! Now it’s a great decoration on my desk