How to Cut Thick Cardboard Safely

Some corrugated cardboard is too thick for a razor blade or craft knife to cut through. Trying to force any knife through thick cardboard can get dangerous and slips may result in serious injury.

A rotary multi-tool with cutting blade attachment has the power to make a quick cut, even through thick cardboard appliance boxes. Take a few steps to protect yourself then power through cardboard to create any design you can imagine.

Mark the thick cardboard piece with a permanent marker guide line that is thick and easy to see.

Put on work gloves and protective eyewear to prevent a remaining staple or jagged edge from causing injury.

Plug in the rotary multi-tool and turn it on as you press the edge of the cutting blade into the beginning of the guide line.

  • Some corrugated cardboard is too thick for a razor blade or craft knife to cut through.
  • A rotary multi-tool with cutting blade attachment has the power to make a quick cut, even through thick cardboard appliance boxes.

Run the tool through the entire length of cardboard to complete your design.

Turn off the rotary multi-tool and use sandpaper to smooth any sharp edges created by your new cut. A vacuum is helpful to clean the cardboard dust that is made by a large cut through thick cardboard.

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