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Bob Knetzger
Bob Knetzger (neotoybob@yahoo.com) is an inventor/designer with 30 years of experience making fun stuff.
Latest from Bob Knetzger
03/10/2025
Here’s a super simple toy: a plastic bubble tip for a paper airplane. Dip it in bubble solution and leave...
12/04/2024
7 tips on building cosplay props and costumes from your favorite show or game.
08/27/2024
Make a science toy that can forecast the weather.
08/07/2024
Needle-felt these mini zombie dolls — and make them yelp!
04/25/2024
Make this pocket-sized prognosticator and let cute emojis guide your future!
02/29/2024
Re-create this trick postage stamp to make pop-up toys and cards.
08/09/2023
It’s a star-filled universe — in your pocket! Hold the Mini Infinity Cube up to your eye and gaze into...
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...
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...
10/29/2020
Here's an example of the Marangoni effect at work. As a bit of detergent is placed in the cut out...
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