MyRCCar Universal Chassis with Light Top and Closed Sides

thingiverse

Hi everyone!!! Here's what you need to build a chassis of 150 mm width and from 255 to 315 mm wheelbase for your RC car. This is one crucial part in the "MyRCCar" project. I wanted to create my second mostly 3D printed car, but this time I wanted it to be mine. As I didn't want to do the same work again for a third car or a friend's car, I designed it to be as open and customizable as possible so more people could find it useful. Many of us can't print beyond 200x200 mm, so I had to split the chassis, but doing this allowed me to achieve bigger wheelbases. The key of this design is combining a front and rear chassis that you like, so you can achieve your desired wheelbase. The front chassis will accommodate the servo, steering system, and part of the battery. The rear chassis will accommodate the motor, part of the battery, and maybe some electronics. To select the correct front and rear chassis, you need to know your desired wheelbase. Your desired wheelbase equals front wheelbase plus rear wheelbase. As you can see in the drawings, the front wheelbase goes from 135 to 150, and the rear one goes from 120 to 165. So, the minimum wheelbase will be 255 mm, and the maximum 315 mm. Many touring or drifting 1/10 cars have a wheelbase of 255-265 mm. I think buggies must have slightly longer ones, and Truggys or Trucks probably more than 280 mm. In 1/8 scale, a 315 mm wheelbase would be similar to that of a normal car, I think 255x1.25 = 318.75 mm, so near. If there is a need to reach 330 mm, I could create versions of front chassis from 155 to 165 mm. The four parts forming a set are in the same .stl file but are separated by 0.01 mm, allowing you to "separate shells" in MeshMixer or your slicing software. This will help you have them together like that to make your own mods easily. ## EXAMPLE BUILD: So, for example, I built a 270 mm wheelbase car. I selected both 135 mm wheelbase for front and rear sets. This would be: MRCC_CHA_W15_SET_FLC135.stl and MRCC_CHA_W15_SET_RLC135.stl. As mentioned in the photos, I have 66+84 mm = 150 mm max battery size. I also printed two "side links", two battery holder towers, the battery holder, and the servo holder. This would be: 2x MRCC_CHA_SD_LINK.stl, 2x MRCC_CHA_BT_TOWER.stl, MRCC_CHA_BT_HOLDER150.stl, and MRCC_CHA_SERVO_HOLDER.stl. All holes are for M3 screws, which are 2.85 mm in diameter for screwing ones and 3.2mm for "passing" ones. All the screws can be 16 mm long but you can use 30mm ones for the central diff from its bottom (through the bottom chassis). As probably you saw in the drawings, you will be able to place the central differential centered or off-center. If you choose the off-center position, you must use the extra holes that can be found 9.5 mm to the right of the in both the bottom and top chassis parts. This will allow you to have enough space for a 50mm width battery, of 5000mah or maybe more. So if you use the off-center position of the center differential do the same with the servo holder so there is enough space for the central dogbone. I have already done the whole car and it works great for me! It has some details in the F/R Diff and the Central Diff that I hope you will find interesting. I will publish the rest of the car in the next hours/days, anyway this was the hardest part. Please, if you are interested in the project and you would like to know more join us or simply take a look at the related group [MyRCCar](https://www.thingiverse.com/groups/myrccar)