0BurfBest Answer 8 years ago ReplyUpvoteMake a form 1 inch larger on each side than the bottom portion of the box in which it will be used and 1 inch deeper (or ½ the thickness of the object to be stored in the box, if greater than 1 inch) out of cardboard. Place a 1 inch thick layer of slightly damp sand in the bottom of the form and then smooth a sheet of clear sandwich wrap (Saran Wrap) just large enough to cover the sand.Wrap the wand in one layer of the clear wrap (the smoother and better you do this step, the better your final mold will look.)Place the wand on the covered sand where you want it to be when the foam mold is finished. Push the wand straight down into the sand a little less than ½ its thickness. Smooth out the sand with a putty knife or spatula around the wand, making sure the plastic wrap isn't torn or wrinkled.Spray urethane foam insulation covering the wand first and working you way in a circular fashion out to the edges of the form.Once the foam has cured you can trim the foam with a serrated kitchen knife or even better, with an electric carving knife, using the sides of the form to guide the blade. Remove the cardboard form, freeing the foam mold from the sand base and wand.Carefully peel the sandwich wrap from the foam and cut it to the size needed for the box.Fill any small voids with Spackle or wood filler, sandpaper to smooth any rough areas as needed and then cover with felt or fabric or spray paint. I've used this method to make storage boxes for my precision tools and it works well.