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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
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...
06/09/2020
Emboss your breakfast like a boss!
10/30/2019
Here’s a fun and easy action game: the Spin ’N Spill Balancing Bot. Stack the gears onto the tippy balancing...
01/22/2019
Upcycle a vintage plaything as a showpiece, comix rack, and reading lamp!
10/10/2018
2018 is the 50th anniversary of the introduction of Hot Wheels, Mattel’s line of die-cast toy cars. You can celebrate in...
07/12/2018
Hack a click pen to make a mini pinball game.
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