Doors sag, frames are out of square, things move. Whatever the reason, some doors need to be straitened. This shim is a quick, easily printable part that can be put between a door hinge and the door or frame. It's designed to fit the screw pattern and cutout of a standard door hinge. If the gap is too big on the handle side of the door, put a shim under each hinge. If it's sagging, put one under the middle hinge and two under the bottom.