3D Printed RC Car Using Brushless Motor

Hi there, I'm Lee from Lee Curiosity. In this article, I will guide you through the process of making my first 3D printed car using brushless motor. It's not working good though but anyway this is my first project with RC car, so I think that it's acceptable to fail and learn from it.

These are the materials you need to prepare:

• MC6C mini–TX AND RX
• Brushless motor
• ESC 40A for Brushless motor
• 65 mm Wheels
• Hex Coupler 4mm
• S90G servo
• Shaft Ø4x150
• M3x45
• 3S Battery
• M3x15 and nuts
• F604zz bearing

If you don't know what the exact components is, you can visit the video description for more details.

As a mechanical engineer, I am passionate about designing and assembling various projects, and I'm excited to build some cool stuff from the ideas to design and 3D printing it in real life. I choose RC car because I really love RC cars actually. For this model I've spent about 2 weeks to design it in Autodesk Fusion 360 from the original ideas. It's really a great experience when you can go through the process of designing, 3d printing and assembling your design. Here are some of the pictures of it.

After designing it, Next step is print all the necessary components.

You can download all of the files here : Cults

It will take about 20 hours to print with my Kingroon K3PS Pro which is really slow because it's a cheap printer compared to its quality. It would be faster if print with the popular with Ender 3 or Anycubic....

After preparing all the needed components, it's time to assemble the chassis.

You will need some M3x15 bolts and nuts to connect the chassis together.

The picture shows the process of assembly. The chassis may need to clean before assembly due to some problems with your printer. Please take that as a reminder.

After finishing the chassis, let's move on to the rear system. Because I use the brushless motor for this project, I have to reduce the speed for better performance, but I was wrong, the speed is still really fast, it makes the car hard to control. I will design another one in the future and have some upgrades from this project.

First you need to attach the shaft holder to bearing and mount it to the chassis. Just use some regular m3x15 bolts and nuts for this part. Because the shaft is quite bigger than the holding bearing, so I have to use sandpaper for making the shaft smaller than the bearing. I don't know if it's good or bad. Hope that I can get some recommendations from you guys. For the driven gear, you have to fix it to the shaft with M3 bolts.

After fixing the rear axle to the shaft holder, As I mentioned before, you need to prepare the 65 mm wheels and the hex coupler 4 mm for this car. These components will come together and the cost about 8-10 USD for 4 wheels and the couplers depending on the locations. We need to fix the coupler to the shaft first, then attach the wheels with 2 M4x10 bolts.

For the brushless motor, attach it to the mounting bracket that I've design to the chassis the same way as other components. After fix the motor to the chassis, make sure that you adjust 2 gears connected correctly. For the smaller gear, I use adhesive to mount it to the brushless motor which cause a lot of problems when the car is running.

We've walked though half of the way to make this project. Let's continue to build the front axle with the basic steering system. I use the SG90 Servo to control the front wheels. I think it's a bad steering system, but it will have some upgrades in the future.

These are basic components for a RC car. Make sure that you've had or already ordered them for the RC car project.

Connect the ESC to the brushless motor. Brushless motor has 3 wires, VCC, GDN and Signal. The ESC also has 3 wires as the same as the motor. Make sure that you connect it to the right terminal.

• VCC ESC - VCC Motor
• GND ESC- GND Motor
• Signal to signal

Connect the ESC and Servo to the RX

• Servo to channel 1
• ESC to channel 3

And the last one, connect the battery to the ESC.

Almost finished, fix these components to the chassis with some wires to prevent it taking off during operation.

Add some accessories for this car for better looks.

That's all and it's time to test and enjoy it.

If you've read until the end of the article, it seems like you have a little bit interest in RC cars. If you like this project, hope you can subscribe to my YouTube channel for more tutorials like this in the future.