Step 1

Cut the Box into Sections Using a Utility Knife
Tape the cardboard box closed. Using a utility knife cut one-third of the length and two-thirds of the width off two sides of the box's top and off two sides of its bottom.
Step 2

Seal the Holes with Duct Tape
Use duct tape to close the holes cut in Step 1. Make sure all of the seams are completely sealed.
Step 3

Cut Openings in the Box
Cut a rectangular opening on the shallow end of the box. Cut a hole in the larger end of the box, big enough for the hose of the wet/dry vacuum to fit in.
Step 4

Seal the Hole with Foam
Tape a square of foam over the hole, and cut an X in the center to accommodate the hose.
Step 5

Try out the Dustcatcher
Place the box close to the work piece, and turn on the vacuum while making cuts with the table saw.