Find all your DIY electronics in the MakerShed. 3D Printing, Kits, Arduino, Raspberry Pi, Books & more!

Inventor/designer Bob Knetzger has 30 years experience making award-winning toys and other fun creations. Over the years, he’s contributed 20 articles to the pages of MAKE, but the very first was his Kitchen Floor Vacuum Former from MAKE Volume 11, so simple it’s evergreen. Want to make custom plastic 3D parts without a fancy 3D printer? Using your oven to melt the plastic and a household vacuum cleaner to supply the suction, Bob’s homemade vacuum former is the way to go. All you have to build is a simple wooden frame and a hollow box.

Bob waxes nostalgic in his intro:

My favorite childhood toy was the Mattel Vac-U-Form. The pungent smell of melting plastic filled my bedroom as I spent many hours molding little cars, bugs, and signs. The way the flat plastic changed shape by invisible vacuum power was magical and fun to watch!

Today, I use vacuum forming to make toy prototypes in my own shop. I usually use a professionally made vacuum former, but in a pinch I’ve used this ultra-cheap, homebrew rig with great results.

Large, commercial machines have built-in vacuum pumps, adjustable plastic-holding frames, overhead radiant heaters, and pneumatic platens. The Guerrilla Vacuum Former is much simpler.

Bob walks you through the build, available in its entirety on Make: Projects, then shows how to make the tiki mask pictured above, which also happens to make a great Jell-O mold. You still have two weeks left until Halloween, so this is the perfect build for this weekend.

Goli Mohammadi

I’m senior editor at MAKE and have worked on MAKE magazine since the first issue. I’m a word nerd who particularly loves to geek out on how emerging technology affects the lexicon as a whole. When not fawning over perfect word choices, I can be found on the nearest mountain, looking for the ideal alpine lake or hunting for snow to feed my inner snowboard addict.

The maker movement provides me with endless inspiration, and I love shining light on the incredible makers in our community. The specific beat I cover is art, and I’m a huge proponent of STEAM (as opposed to STEM). After all, the first thing most of us ever made was art.

Contact me at goli (at) makermedia (dot) com.



  1. Gotta love the Tiki!!!

  2. Loweise Wade says:

    That’s a very great tutorial. I can’t wait to pass this information to my hubby.