Design a Robotic Arm

Design a robotic arm that can move a marble, a straw, and a coin from the table into a cup without using your hands.

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Inspiration Video

Suggested Materials

  • tape
  • popsicle sticks
  • rubber bands
  • string
  • dowels or skewers
  • straws
  • pipe cleaners
  • paper clips or brass fasteners
Testing Station
  • coins
  • marbles
  • cup
  • straws

Difficulty Level


This design challenge may require moderate motor skills, understanding of some abstract concepts, or uncommon materials to build.