Since the release of CyberBrick, us creators got the ability to create amazing projects. CyberBrick sentence the new era of electronics and modular systems, all that combined with 3D Printing.

Not only us as creators but also all the Makers and Users from all over MakerWorld and the whole 3D Printing community got into our hands this amazing gift given by MakerWorld and BambuLab. And every single one has been trying to exploit CyberBrick Ecosystems in every single possible aspect and this is what my new GT-RC 4S Chassis is all about.

Long time ago I released the GT-RC S and the GT-RC R, 2 modular chassis based on the same phylosophy, they should be able to accomodate any single possible car that I could Imagine and that I would love to have in my hands but this time with this project (GT-RC) It wasn´t anymore about 3D Printing something and then just let it catch dust in a display rack. This time not only me but users from all over the world where able to not only feel the things that they 3D Printed, but also drive them and watch them in action.

Since the Release of GT-RC S I´ve released more than 12 cars and all of them are compatible with GT-RC S and GT-RC R, but being honest, everytime I wanted to have fun and take this cars for a ride or even go with friends and make some races I never took the GT-RC S, this chassis is the small brother of the GT-RC Family and it was based on the CyberBrick and MakerSupply Architecture, the problem with this last one is that it was barely able to reach top speeds of 6Km/h while it´s big brother the GT-RC R was able to reach top speeds of 70 to 80 Km/h.

 I really Enjoyed tinkering and playing with the GT-RC S, it was easier to use and more accessible, thanks to the CAD Files provided by MakerSupply I was able to create a chassis with better ergonomics, functionality and accessibility but the philosophy of this chassis was to only be compatible with MakerSupply components, that means that the highest performance engines were the N20 1000RPM´s but the problems comes when you take a look to the physics behind small electric motors.

When I released the GT-RC S Chassis inside the BOM People can find the needed components and inside that list, the N20 400RPM Motors arrived, people was constantly asking why the 400RPM and not the 1000RPM? Well the answer is simple, the higher the RPM´s the Lower the Torque, so in real world conditions and after some tests, I was unable to use the N20 1000RPM Motors, cars barely were able to start and move from their stading position, this 3D Printed Cars are heavy and some people complained about the waste of plastic involved in the shells and how time consuming they are, but again there´s a reason for that.

The another side of the story when it comes to the 3D Printed Shells and why they have so much infill or why they are so heavy is just for one single reason, GT-RC Started on it´s roots with the GT-RC R, the GT-RC S was something that I never planned, CyberBrick arrived right in the middle of the development of the GT-RC R. And once I completed the first functional prototypes of this last one, I found a problem, cars had no grip, no matter what TPU Filament I used for the Tyres, so the cars needed more weight to transfer more grip to the ground and that´s the main reason but again this decision came at a cost that I never expected it would affect another project that I was about to launch, the GT-RC S.

So when I already had available the shells of GT-RC and the GT-RC R First protoype I started to work on the GT-RC S, I was so excited to release a CyberBrick version of my modular chassis, but again we go back into the start, the main problem, the powertrains offered by Maker´s Supply, the options were N20 400 or N20 1000 and as most of you already know and based on the results that previously said in this post, I had to use the N20 400, Speed? Boring compared to GT-RC R, Emotions? Almost non Existent, Fun? Nope. But don´t get me wrong I knew the reasons and I don´t blame the motors or the ecosystem by itself, I still was amazed that such tiny motors were able to move those big 1/12 scale Big Blocks of 3D Printed PLA, Some cars were almost at the point of weighting 1Kg.

So going back to the start, CyberBrick offered an ecosystem that allows us creators to make anything we have in mind, the limit is our creativity and my creativity and head were constantly telling me to improve and make faster the GT-RC S. So the solution? Simple, Adding more motors to the Formula, But Applying the solution into the practice? Well that is the complex part and where the headaches started.

So based on that idea of applying more motors there was 2 possible ways, implementing 4 motors in the rear or implementing 4 motors at each wheel, 2 at the front 2 at the rear, the first solution easy, but the crazy or reinventing factor was poor and I really wanted to release an AWD Chassis, wich was something that I never did, so I went with the second solution, more complex but it had more of a crazy factor.

So I started tweaking in the CAD and as soon as the .STEP File of the N20 Motors arrived to the front Axis, the problems started everywhere, the Motors were colliding with everything, they were hitting Both Suspensions Coilovers, they hitted even the central pillar of the front chassis, when suspensions compressed they hit the control arms, the steering rack? Impossible to connect it to the Front Axis, so the solution needed more of my creativity, I had to make an Entire new Front Chassis, new Steering Design, new Stronger and at the same time thinner suspensions and also I had to fix and change some things that I didn´t liked from the GT-RC S, things that some users complained about and that I had to redesign, but after 1 Month, evey single solution arrived, with patience and determination. And the Results? Well you can check my new CrowdFunding Campaign and see the new GT-RC 4S and see why it´s the new era of modular CyberBrick Chassis, a new chassis that now it´s really well paired with CyberBrick and a Chassis that now I really want to use and that extracts every single possible potential available from the currenet hardware for CyberBrick.

So you can consider this as the Prologue of what you´re about to see in the GT-RC 4S Presentation Video.

https://makerworld.com/en/crowdfunding/254-gt-rc-4s-next-gen-cyberbrick-modular-rc-chassis