YouTube user kiwami japan has a bit of an odd obsession with making homemade blades and other weapons from obscure and unusual materials. Case in point. This knife wasn’t made from a hard-to-find metal, but from a roll of aluminum foil you likely have stashed in your cupboard to wrap a sandwich or make tin foil hats.

What some may not realize is that enough sheets of aluminum foil can become a block of aluminum foil. And said block can be sharpened. Crafting a knife from a sandwich wrapper isn’t simple, with considerable tempering and hammering of the layers needed to create the slab of metal to be sharpened.

aluminum foil kitchen knife

aluminum foil kitchen knife

From the hammered layers, Kiwami traces an outline on the slab of metal and cuts it out using a hacksaw. This serves as the blade of the knife and will be subject to hours of sharpening on a variety of different whetstones from 150 grit all the way up to 30000 grit. The actual sharpening begins at the 5:30 mark in the video below.

YouTube video

As before, Kiwami rough cuts a slab of wood then sketches the shape of the knife handle before shaping and sanding it down.

aluminum foil kitchen knife

To put it all together, he drills two holes through the handle and blade before jamming two screws in. Once the pieces are firmly attached, he cuts of the screw heads back with a hacksaw and files down the rough edges.

aluminum foil kitchen knife

It might not last as long as other commercial knives, but this baby sure can cut cucumbers like it’s nobody’s business. A knife is one thing, but imagine using a homemade crucible to melt it down and mold other objects – even fashioning a knife from aluminum foil would seem longer lasting than hammering the layers for hours. I dunno, have you tried it?

You can find more of kiwami japan’s homemade madness over on his YouTube channel.


Carlos wrestles gators, and by gators, we mean words. He also loves good design, good books, and good coffee.