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Make: Volume 44 by Jason Babler

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Toy Inventor’s Notebook

TINY TOY CARTESIAN DIVER

Invented and drawn by Bob Knetzger

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Time Required: 20 Minutes

Cost: $1–$2

Materials

» Polyethylene (PETG) tube with vinyl end cap, ½" diameter

» Styrene plastic rod, ½" diameter

Tools

» Grinder or file

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» Clip out and tape to your Cartesian Diver!

BACK WHEN CEREAL COMPANIES HAD BUDGETS to do such things, I got to invent some fun “free inside” premiums. It’s a real challenge to come up with a toy idea ...

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