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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
07/12/2018
Hack a click pen to make a mini pinball game.
11/03/2017
In two easy steps, you can use these free downloadable stencils to decorate your windows for the winter holidays.
07/28/2017
Jay Silver’s 2008 Drawdio combines a simple 555 timer circuit with a pencil to make squeals, beeps, and other musical...
07/05/2017
These string racers climb up strings by using friction and alternating tension/slack. Make two and race to the top!
03/02/2017
Whizz it around your head and hear it roar!
11/03/2016
Laser cut this slot-together raceway and for a fun, gravity-powered racing game.
06/27/2016
Use moldable plastic to create great new practical jokes!
04/20/2016
Based on a classic cereal box toy, this fun "spudmarine" uses a potato and baking powder to make a sub...
03/03/2016
You can transform a drawing into a distorted coloring book page that reveals the image in a curved mirror.
03/02/2016
Create custom tiddlywinks using your own unique design and polystyrene film.
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