Bob Knetzger

Bob is a designer/inventor/musician whose award-winning toys have been featured on The Tonight Show, Nightline, and Good Morning America.

Author of these Magazine Articles

Good Vibrations: Groovy Mechanical Sound Players
A look back at the all-mechanical marvels that made fun sounds for over 100 years.
In Maker from MAKE: 29: DIY Superhuman page 36

Root Beer Pong Bot
Here’s a “noninvasive hack” that takes advantage of ReCon 6.0 Programmable Rover’s cool features while adding a fun new function to make a “Root Beer Pong Bot.”
In Toy Inventor's Notebook from MAKE: 29: DIY Superhuman page 161

Science in Your Cereal Bowl!
These famous cereal premiums were tiny — but packed with mighty scientific principles!
In Maker from MAKE: 28: Toys and Games page 38

Mastering 3D Views
William Gruber put the magic of stereoscopic photos in our hands.
From MAKE: 28: Toys and Games page 58

"Level Best" 3D Camera Slide-Bar Hack
You can make a DIY camera slide bar fast and cheap that’ll work just as well as a professional one.
In Toy Inventor's Notebook from MAKE: 28: Toys and Games page 155

Make a Diving SpudMarine!
Here's a fun and fast way to create a homemade version of the classic cereal premium toy, the baking powder-powered diving submarine.
In Toy Inventor's Notebook from MAKE: 26: Karts and Wheels page 164

Things of Science
Miniature monthly science surprises!
In Maker from MAKE: 25: Microcontrollers and Arduino page 36

Amazing Maker Marble Maze

In Toy Inventor's Notebook from MAKE: 25: Microcontrollers and Arduino page 164

Steamy Honeymoon Goggles
Balloon-Dispensing Steampunk Honeymoon Night Vision Goggles!
In Toy Inventor's Notebook from MAKE: 24: Space page 151

Guitar Amp Bulletin Board
Use a piece of vintage speaker cloth to make a mini "guitar amp" bulletin board.
In Toy Inventor's Notebook from MAKE: 23: Gadgets page 147

Productive Plastic Playthings
A look back at 1960s maker toys.
From MAKE: 20: For Kids of All Ages page 50

Talking Booby Trap
Surprise enemy spies with the sound of your own voice.
From MAKE: 16: Spy Tech page 60

5-Minute Foam Factory
Cut 3D shapes out of styrofoam.
From MAKE: 16: Spy Tech page 114

Kitchen Floor Vacuum Former Download PDF.Download Sample PDF (excerpt)
Mold light, durable, and cool-looking 3D parts in your kitchen.
From MAKE: 11: Alt Vehicles page 106

Photographer for these Magazine Articles

Good Vibrations: Groovy Mechanical Sound Players
A look back at the all-mechanical marvels that made fun sounds for over 100 years.
In Maker from MAKE: 29: DIY Superhuman page 36

Science in Your Cereal Bowl!
These famous cereal premiums were tiny — but packed with mighty scientific principles!
In Maker from MAKE: 28: Toys and Games page 38

Mastering 3D Views
William Gruber put the magic of stereoscopic photos in our hands.
From MAKE: 28: Toys and Games page 58

Things of Science
Miniature monthly science surprises!
In Maker from MAKE: 25: Microcontrollers and Arduino page 36

Talking Booby Trap
Surprise enemy spies with the sound of your own voice.
From MAKE: 16: Spy Tech page 60

5-Minute Foam Factory
Cut 3D shapes out of styrofoam.
From MAKE: 16: Spy Tech page 114

Kitchen Floor Vacuum Former Download PDF.Download Sample PDF (excerpt)
Mold light, durable, and cool-looking 3D parts in your kitchen.
From MAKE: 11: Alt Vehicles page 106

Illustrator for these Magazine Articles

Root Beer Pong Bot
Here’s a “noninvasive hack” that takes advantage of ReCon 6.0 Programmable Rover’s cool features while adding a fun new function to make a “Root Beer Pong Bot.”
In Toy Inventor's Notebook from MAKE: 29: DIY Superhuman page 161

"Level Best" 3D Camera Slide-Bar Hack
You can make a DIY camera slide bar fast and cheap that’ll work just as well as a professional one.
In Toy Inventor's Notebook from MAKE: 28: Toys and Games page 155

Make a Diving SpudMarine!
Here's a fun and fast way to create a homemade version of the classic cereal premium toy, the baking powder-powered diving submarine.
In Toy Inventor's Notebook from MAKE: 26: Karts and Wheels page 164

Amazing Maker Marble Maze

In Toy Inventor's Notebook from MAKE: 25: Microcontrollers and Arduino page 164

Guitar Amp Bulletin Board
Use a piece of vintage speaker cloth to make a mini "guitar amp" bulletin board.
In Toy Inventor's Notebook from MAKE: 23: Gadgets page 147

Talking Booby Trap
Surprise enemy spies with the sound of your own voice.
From MAKE: 16: Spy Tech page 60

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Current Discussions

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Zombie Attack! -- Zombie Survival Science Fair
Awesome, Ian! Can't wait to see what you come up with! ...

Zombie Attack! -- Zombie Survival Science Fair
Hi, Im Ian and I have been looking in all the make magazines I have for an idea for my grade 9 scien...

Solar Pendulum -- Solar pendulum
Hi Marc, The circuit is essentially just a switch which is triggered by the current induced when ...

Solar Pendulum -- Solar pendulum
Hi there, Nice project. Just a couple of questions about this circuit. I'm new to electronics...

The Luna Mod -- Minor typo in the schematic
Thanks for your sharp eyes! We just posted a corrected schematic above....

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