This is my latest bristle bot. When designing, I ran into a problem. I had no bristled surface bigger than a toothbrush! So I imprevised. I used three toothbrush heads instead of the usual one.

Step 1: Materials

You will need:

3-Toothbrushes
1-Bamboo Skewer
1-Gift Card

1-Vibrating Motor
2-AAA's (I started off with AA's, but they were too heavy so I switched)
1-Switch

1-Hot Glue Gun
And a Boatload of Hot Glue
1-Wire Strippers/Cutters

Step 2: Making the Frame

First, cut the heads of all three toothbrushes.

Then trim the bamboo skewer into three pieces that will make a triangular frame.

Finally, hot glue it all down.

Step 3: Add the Platform

Flip the frame over onto its back. Then trace its outline onto a used gift card. Cut it out and test it to see how it fits onto the frame. If it fits, hot glue it on. Save your scraps from the gift card though, because you will need it for the next step.

Step 4: Attaching the Motor & Testing It Out

Use the scraps to attach the motor so it is standing upright in the center of the platform. It is a little tricky, so be patient.

Then rubberband the batteries to the bottom and use alligator clips to start 'er up! When it works, take the rubberband and alligator clips off.

Step 5: Finish It Up!

For the last time, hot glue the batteries to the bottom of the frame. It should stay just off of the ground. If it doesn't, get a new battery case. Then trim up the wires and add a switch.