Building an open box on rollers to fit under the bed is an easy way to reclaim that unused space from the dust bunnies. The box storage unit offers a great place for children's toys. In the parents' room, little-used but necessary items like small suitcases and seasonal clothing in storage bags occupy the box out of sight until you need them.
Determine under-bed clearance and allow for additional height required by the diameter of the wheels. Plan the depth of the roll-out box fractionally lower. Select a method of joining components. This project uses locking rabbet joints.
Cut one-by-sixes to length for the four sides of the roll-out under-bed storage drawer with a power miter saw or chop saw. In this stage, each of the four sides is simply straight-cut on the ends.
Install a three-blade stacked dado set on the table saw and notch both ends of the four side pieces. In a later step, the sides will join as a four-sided drawer for the roll-out under-bed storage unit.
Use a different set of dado blades to make a 1/4-inch grove along the bottom length of each side panel. The bottom of the under-bed storage box will slide into this groove later.
Brush carpenter's glue on the rabbets on both ends of one side piece and only one end of two other pieces. Fit them together as three sides of the under-bed storage drawer. Clamp them and secure the joints with nails.
Guide the 1/4 inch plywood bottom into the groove along the bottom of the three assembled sides of the under-bed storage unit. Tap it with a block of wood to seat it in the groove.
Brush glue on the rabbets on the last side and fit it to the under-bed storage box. Do not apply glue to the bottom panel anywhere, because it may expand and contract with temperature changes.
Cut wooden wheels from one-by-four scraps for the under-bed storage unit. Use a large hole saw on your drill press and, if necessary, knock the cutouts out of the hole saw by tapping gently with a hammer and nail set.
Assemble axles and caps for each wheel along with double washers to space them out from the sides of the box. Add epoxy to the free end of the axle and insert into predrilled holes on the rolling storage unit.
Mark drawer pull positions on the front of the rolling storage unit and pre-drill a pair of holes for each. Insert screws from the inside of the drawer into the back of the pulls and snug them with a screwdriver.