Bob Knetzger

Bob Knetzger (neotoybob@yahoo.com) is an inventor/designer with 30 years of experience making fun stuff.

Latest from Bob Knetzger

Toy Inventor’s Notebook: Weather Bird

Toy Inventor’s Notebook: Weather Bird

08/27/2024

Make a science toy that can forecast the weather.

Toy Inventor’s Notebook: Talking Zombie Needle-Felt Doll Maker

Toy Inventor’s Notebook: Talking Zombie Needle-Felt Doll Maker

08/07/2024

Needle-felt these mini zombie dolls — and make them yelp!

Toy Inventor’s Notebook: Mystic Emoji Fortune Teller

Toy Inventor’s Notebook: Mystic Emoji Fortune Teller

04/25/2024

Make this pocket-sized prognosticator and let cute emojis guide your future!

Toy Inventor’s Notebook: Fun With Pop-Up Stamps

Toy Inventor’s Notebook: Fun With Pop-Up Stamps

02/29/2024

Re-create this trick postage stamp to make pop-up toys and cards.

Mini Infinity Cube

Mini Infinity Cube

08/09/2023

It’s a star-filled universe — in your pocket! Hold the Mini Infinity Cube up to your eye and gaze into...

A Can Full of Tone

A Can Full of Tone

06/19/2023

Vintage Gibson electric guitars had a special circuit for modifying the sound of the pickups: the Vari Tone (Figure A). You could...

Don’t Drop Your Bot! A Fresh Take On A Classic Game

Don’t Drop Your Bot! A Fresh Take On A Classic Game

03/22/2023

Here’s a classic skill-and-action game updated for you to make and play. You and your opponent each start your robot at...

Toy Inventor’s Notebook: Make a Miraculous Marangoni Soap Boat

Toy Inventor’s Notebook: Make a Miraculous Marangoni Soap Boat

10/29/2020

Here's an example of the Marangoni effect at work. As a bit of detergent is placed in the cut out...

Emboss Your Toast With A Custom Toast Stamper

Emboss Your Toast With A Custom Toast Stamper

06/09/2020

Emboss your breakfast like a boss!

Toy Inventor’s Notebook: Spin ’N Spill Balancing Bot game

Toy Inventor’s Notebook: Spin ’N Spill Balancing Bot game

10/30/2019

Here’s a fun and easy action game: the Spin ’N Spill Balancing Bot. Stack the gears onto the tippy balancing...

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