BristleBot Model 3

Target Audience

  • Children (age 8-14)
    BristleBot Model 3
  • Adults (parents/guardians)
    • Who would accompany the children to replicate this model

Starting Point

  • Get a feel for visual conception through this Youtube Tutorial Video
    • This helps to capture an image of a generic BristleBot Model
  • Derive the features for the BristleBot from |Hexbugs

Replication Goal

  • Instead of copying the Youtube Bristlebot, remodel its structure and design based upon the listed materials
    • Be creative to gain children's attention and their interests in making this bristlebot
  • Like nano hexbugs, the replicated model must move as well
    • The vibration caused by the model allows the Bristlebot to move in a direction
    • Angle the brush/base so that the model moves forward; not in a loop of random directions
  • Improvements from the previous BristleBot Models
    • The balance issue has to be accounted
    • Maintain the safety rules as BristleBot Model 2 centered on
    • Like BristleBot 1, the model must be appealing to the eyes of children


  • 5 in. by 5 in. wooden block
  • Three $1 material's brushes
  • $1 material's motor
  • Two 3 in. metal strings
  • Duct Tapes (Grey and Orange Colored)
    • Not mandatory to have separate colors but it looks nicer this way

Procedure: BristleBot Model 3 (Pics)


Procedure: BristleBot Model 3 (Vids)

  • Step 1: How to Assemble Model 3's Base
  • Step 2: How to Attach Metal Strings on to the Motor
  • Step 3: Attaching the Motor to the Wooden Block
  • Step 4: Duct-Taping Battery onto the Wooden Block
  • Step 5: Duct-Taping Metal Strings onto Battery

BristleBot 3 Testing



  • Significantly safer model compared to the BristleBot Model 1
    • No sharp needles or dangerous materials required
  • Assembly style to build this model
    • Each compartment could be replicated by young children by simply stacking each layer on top of each other
      • Bottom = Toothbrush
      • Middle = Wooden Block
      • Top = AA Battery + Motor
  • Duct tape is flexible yet relatively durable to stay attached to the model
    • It can also be easily cut with scissor
  • Relatively simple and easy to make
    • The cutting parts for duct-tapes can be done faster under adult supervision
    • No complex or tedious coiling of wires required to attach them to this model's motor
  • Portrays an image of a tank
    • Children might find this model appealing to their eyes
    • Relatively creative external features
  • Stable and the model doesn't fall to one side
    • Unlike the BristleBot Model 2, prior to the motor activation, the model doesn't fall down to the ground


  • Exposure of vibrator
    • As the vibrator spins to cause movement, children's hair (especially girls') could be rolled up
  • The model lacks mobility
    • Cannot move unless the user constantly hold onto the wires firmly
    • When let go, the model almost immediately shuts down
  • There is no 'real switch'
    • Duct tape may have been used to attach the wire onto the battery but it peals off eventually
    • Can only 'move' or 'function' if the holder consistently presses the wire onto the battery
    • Frustrating for the young children due to its limited ability to move
    • As seen in the video, occasionally, despite pressing onto the battery, the model doesn't function