World's Fastest 3D Printed BO Motor Wheel

I am making mobile robots for a while now, but the one thing which is still not changed in my journey is the use of those slow yellow colored BO Motors and their boring wheels. So, I wanted to change it and this is why I came up with the fastest, compact, inexpensive and 3D printed BO motors which I think is an amazing upgrade for my upcoming robots which will make my robots go faster.

I hope you will enjoy the build too as much as I did making it :)

1. Drone motor set [including screws]
2. ESC for Motor
3. Lipo baterry 3S
4. ESC tester
5. BO Motor wheel
6. Suitable adapter to connect ESC to battery

Tools:

1. 3D printer
2. Allen keys

I have added the images of the supplies which are necessary to get the reference.

Why I am using the cheap BLDC drone motor instead of branded one?

After searching a while, I found that it's the most inexpensive and readily available BLDC drone motor that you can buy as compared to the branded one.

Why I have not 3D printed the outer part of wheel?

My 3D printer doesn't allow me to do so and buying a wheel worth $0.5 or ₹40 is more convenient and cheaper for me as compared to buying a new 3D printer or upgrading my 3D printer :)

Watch the animation to have the better understanding of upcoming steps. This project is designed in Autodesk Fusion 360, animation as well.

So, here we just have two parts to be 3D printed which are as follows. So, after watching the animation, you might now be familiar where we are going to use them. If not, don't worry, I have explained each step in detail in upcoming steps. For now, just download, slice and 3D print them. I am using Prusa slicer, but you can use any slicer of your choice. There is no need of support to print them, so print re-orient them if needed. 30-50% infill will be more than enough.

It took me around 3hrs to print both the parts and almost 34g of filament.

The BLDC motor we are using are originally designed for drones, so we have to do some modification to make them usable for our project. The steps are very straight forward. After modification, we will assemble all the parts together. Let's begin...........

Firstly, we have to remove the shaft holding clip which is used to keep the prevention the detachment of top part when the propeller is attached on it due to thrust. Take a sharp object is pull it sideways. Without the removal of this clip, you won't be able to separate the upper and lower half of the motor.

Now, you can easily pull the upper and lower half of the motor. Be careful while doing this because when you will try to pull the lower part out at the same time the magnets inside the motor will try to pull the lower part inwards as a result of which you may get harmed if your finger will be in between the upper and lower part.

There is a grub screw that hold the shaft in place and prevent any dislocation of the shaft while working. We have to remove it because we have to adjust the height of the shaft.

As, grub screw is now removed, you can place the upper part of the motor on the suitable surface so that the shaft can go down while pressing. You have to apply a lot of pressure here, I have used a hammer to do the same.

As the inner section of the motor will rotate at very high speed as a result of which the 3D printed part will not be able to move with it because we are not using any adhesive here. So, to make the 3D printed part move with the motor, I have added 4 support pins that will go inside the holes and help the 3D printed part move with the motor.

Once you have aligned the holes with the support pins, press the motor inside the 3D printed part.

Now add the rubber part on the 3D printed part. I have removed the rubber part from an inexpensive BO Motor wheel which save my designing and printing time.

Notice the distance between the holes which are opposite to each other. One set of holes have shorter distance as compared to the other set. And we will be using this set with shorter distance to connect our 3D printed mount.

Place the 3D printed mount as mentioned above and add the screw that came with the motor.

To avoid tangling of wires, pass the wires through hole as shown in image.

This is the final assembly step, join the upper and lower half and your wheel is now ready to rock on.

This is how my test setup looks. Simple and elegant.✨

To test the wheel I have used the ESC tester and the motor is working as I am expecting it to work🚀

How I calculated the RPM?

RPM = KV of motor X Battery voltage = 1400KV X 11.1V = 15540.

Why I am operating it at 50% ?

As I am holding the wheel in my hand and I don't want to kill myself because it needs a lot of force to hold it😂

Issue 1resolution: There are a lot of different types of this cheap motor available in the market, the major difference comes in the size of the holes near the top surface. If your motor has smaller size of holes, take a drill and enlarge it a bit or find another motor 😉

Issue 2 resolution: If the motor is loose inside the 3D printed part, add a small piece of paper, and you are good to go.

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