Taking inspiration from a rotary can opener, he uses a pair of circular blades in an adjustable injection moulded plastic frame. If you’ve used a pipe cutter than maybe you are familiar with the ...

The can opener hadn't been created ... Line the tip of the blade along the inside rim and carefully puncture the top. Then ...

turn your hand-operated can opener sideways, with the crank facing up. Clamp the blades together around the rim, versus directly down on the lid. Turn the crank, and you'll notice a clean cut ...