DIY Mecanum Wheel Car Kit with Metal Chassis and TT Motor Smart Robot 4WD Omnidirectional Car Programming Kit with Speed Encoder for Arduino/Microbit/Raspberry Pi for Adult Age 15+(Unassembled)

No missing parts, and there are plenty of spares left for future usage. The metal chassis is durable with plenty of mounting positions and wiring holes. Assembly is a breeze except the directions of wheels, which highly depend on how motors are installed, also there is a missing step in the tutorial video that plastic spacers should be installed to shafts for reducing the axial motion. A significant setback for my robotic hand is the insufficient torque of TT DC motors, sadly high-torque motors are not compatible with the chassis. Considering the price, it is an excellent product for DIYers.

It was almost everything I expected. It is a quality kit to use as a base for a project. Unlike most kits, it doesn’t include wires to connect the motors. I expected to have to solder them, I didn’t expect to have to supply them. I’d give it 4.5 stars if I could. The kit arrived on time and undamaged.

This was an all metal chassis at a great price! I am very happy with this easy to build kit. Looking forward to experimenting with it!

The wheels are attached to the frame with 2 long bolts each (at least I think that's how it's supposed to be), but there are only 4 nuts in the package. I assume the small bolts with lock washers are for using with the stand-offs to attach the top and bottom chassis together. It seems like OK quality, but I'm not overwhelmed with awesomeness. If you don't mind sourcing your own parts and figuring things out for yourself, it's merely OK.

Este set es bastante interesante para implementar un sistema de robotcar multidireccional... Faltó depronto por parte del fabricante una guía más específica de ensamble... Sin embargo es bastante intuitivo el procedimiento

Overall pretty good base, I like the 2 layered design. As with everything there are pros and cons, and I'll start with the cons since they're kinda important to know: 1. My order was missing 4 of the 8 Lock Nuts that need to be used to tighten the motor to the body, and there's no other option except sending back my (completely assembled) product according to Amazon, so I'll probably have to go to the hardware store and get some myself. Might not be a problem for you, but mine had some missing. 2. Even if I had all the lock nuts, the provided screwdriver and wrench were horrible for screwing the lock nuts and screws in. The screwdriver did not even fit the Screws (and I had to use my own), and the wrench type made it impossible to hold onto the lock nut. It took me over 30 minutes just to do 4 of them. 3. The provided battery case will not screw to the body. They have only provided the screws for the battery case and no nuts. (even the product images show no nuts to hold them to the frame) 4. Motors given might be low quality, given that they do not rotate at the same rate. 5. There are no instructions. The provided paper has no instructions for how to put it together. While this wasn't a problem for me, beginners with no hardware knowledge might mess up. Additionally, all the product pictures have the wheels oriented incorrectly. The wheel rollers all need to point inwards, forming an X. The product pictures as well as info card have this wrong. Minor Con: They provide the wires for the motors as 'free gifts' but you will still need a soldering iron to solder them to the motors. The Pros for this are: 1. Mecanum wheels seem pretty decent, although these are my first ones. 2. the Battery Case for 18650 Batteries is included and you can fit 2, which should provide the required 7.2V to power the motors, but I dont have any so I cant test if it works. 3. The build quality is also pretty good. There are a TON of mounting spots for Arduinos and the like, but I still need to find out if I can mount both an Arduino and a Raspberry Pi. I will add pictures/videos once my order for batteries come in, but till now I've only gotten 1 motor running due to power/voltage requirements. Overall, probably will not return, although will see this in a week or so if I still cant get it running properly. Will be a learning challenge for me. Edits: Added 4th and 5th Con

I'm at a loss for the ir sensor module that is supposed to mount to this frame. It comes with the slotted wheels, but not even a hit at where to find the actual sensor.