How to make a Fidget Spinner


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A few weeks ago, my son and I reverse engineered a fidget spinner. We learned what the toy was made out of, and talked about how we could make one for ourselves. The fidget spinner included 4 bearings (one being a high speed bearing) and a plastic case. In the process of reverse engineering the toy, we learned how to make a fidget spinner. As soon as we were done, my son looked at me asked “Can we make one?!?!” To which I answered him “Of course!” I was able to find all four bearings online, so all we needed to do was figure out how to make the casing! My son was so excited when I told him I had figured out how we could make his very own fidget spinner!

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

How to Make a Fidget Spinner

After learning how a fidget spinner was made, my son and I now set off to make one of our own! First we gathered our supplies.

Post contains affiliate links.  For more information please see disclosure.

Supplies

3 bearings
1 high speed bearing
Molding kit
Clear Drying Resin
1 sheet of Foam board
Duct tape
X-ACTO knife
Syringe

Making a Mold of the Fidget Spinner

The first step to making our own fidget spinner was to make a mold of the casing. In order to do so, we needed to remove the bearings from the casing. The bearings in a fidget spinner we reverse engineered were not glued into the holes of the casing, but were interference fitted together. This means that the outside diameter of the bearing was just slightly bigger than the diameter of the hole the bearing fits into casing. Once the bearing is pressed into the hole, the friction force between the to surfaces creates a permanent fastening of the two surfaces. Industry uses several ways to create bonds using interference fits, but we were going to get the bearings to fit into the casing by shrinking them!

What?!? How do you shrink something? Simple answer? Freeze it! When something freezes it shrinks ever so slightly. This is because the atoms have a lower energy at the lower temperature. Simple put, when the bearings are at room temperature, the metal’s atoms are slightly moving, while when they’re frozen they are still.

I explained all this to my son by acting out being an atom. At “room temperature” I wiggled in my seat.When I was an atom a cold temperature, I froze. He had a good laugh at mom wiggling, but got the point! I then asked him to put the new bearings in the freezer.

To take the bearings out of the fidget spinner’s casing, we just pushed the bearings out. To be honest, we had to wait for daddy to get home to do this step. Neither my son or I had enough strength, but my husband was able to push them out, no problem. Now that we had the fidget spinner apart, we looked at all the parts once again:

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!



 

Make a mold of the casing

With all the bearings out, it was time to make a mold of the casing. Here are our steps to making a mold of the casing:

Step 1: Cut down a milk carton to be approximately 1 inch tall.

Step 2: Hot glue the casing to the milk carton. Make sure to leave a small gap between the bottom of the milk carton and the casing. This gap is to allow the molding mixture to get under the casing.

Step 3:  Mix the molding kit according to the instructions.

Step 4: With a spoon, slowly pour the molding mixture over the casing and into the milk carton. Once the fidget spinner casing is completely covered by the molding mixture, set it aside and let it dry per the instructions provided by the kit.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

Step 5: Once the mold is completely dry, take it out of the milk carton.

Step 6: Use an X-ACTO knife to carefully cut the mold, pull the casing out, then close the mold.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

 

Prepare the mold

Step 1: Trace the shape of the mold on a piece of foam board, and cut it out using an X-ACTO knife.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!



Step 2: Place the mold back into the milk carton, then place the cutout foam board on top of the mold. Wrap duct tape around to apply pressure to the mold.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

Step 3: Find the two holes at the top of the mold created by the two places where the casing was hot glued to the milk carton. Cut away the “lip” of the carton blocking the holes, and wrap duct tape between the two holes.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

 

Make your own custom fidget spinner casing!

Step 1: Mix the clear drying resin per instructions. Add glitter or coloring as you would like. I added some silver and red glitter just for fun!

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!



Step 2: Using a syringe, pour the resin mixture into the fidget spinner casing mold. I used an old medicine syringe.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

Step 3: Set the mold to the side and let the resin dry according to the instructions. The resin we used required 48 hours to dry.

Step 4: Once the resin is dry, remove the new fidget spinner casing from the mold.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

Step 5: You will notice pieces of resign on the inner and outer part of the casing. This is called “flashing”. My son removed most of the flashing with his hands, and the I used an X-ACTO knife to clean it up.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!




How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

 

Putting the Fidget Spinner Together

Step 1: Remove the new bearings from the freezer.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

Step 2: Push the three bearings into the outer three holes in the casing, and push in the high speed bearing into the center hole of the casing.




Step 3: Snap the caps from the original spinner into the high speed bearing.

How to make a fidget spinner | Fidget Spinner DIY | How my son and I make our own Fidget Spinner with bearings!

And now you have your own, handmade fidget spinner!

How did your fidget spinner turn out? What colors or glitter did you add to the casing? I would love to see how your spinners turned out!

Check out some of my other posts and learn more about STEM and Engineering!

Reverse Engineering a Fidget Spinner

Teach your Kid about Biomechanical Engineering
STEM In the Kitchen
Tinker Crate: Exploring Polymers
Tinker Crate: Circuits and Optics
Teach your kid to be a Materials Engineer
Teach your kid to be a Project Engineer
Teach your kid to be a Reliability Engineer
Teach your kid to be a Mechanical Engineer
Be a Process Engineer: Play “How’s it Made?”
Exploring Energy: How Are Height and Distance Related?
An Explosive View of a Dinosaur!

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