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Bob Knetzger

Bob Knetzger

Bob Knetzger ([email protected]) is an inventor/designer with 30 years of experience making fun stuff.

Latest from Bob Knetzger


Perhaps the most iconic 80s music toy was the Magical Musical Thing from Mattel. The TV commercial featured a kid playing melodies with one finger on the toy’s keypad strip — and finishing by playing it with his head! Now you can make your own custom version! Read more »

hummingbird feeder.2

Stop ants from getting into your hummingbird feeder with a DIY moat. Read more »

Fig. F: Flip!

Make your own custom shaped cookie cutters two ways: either traditional aluminum or vacuum formed plastic. Read more »


How to make your project better through smart design. Read more »

Fig. C: Magnify!

Gelatin is used in lots of things like food, candy, and pharmaceutical and paintball capsules, but it also has interesting optical properties. Read more »


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