3D Printed Beam Compass for Large Circles: Mark Arcs Too Big for a Compass

A bright home workshop scene, a matte charcoal-gray 3D printed beam compass with a long wooden beam spanning a large plywood sheet

Introduction An ordinary compass tops out at small work — a 150 mm radius if you are lucky, less with a wobbly school compass. But home projects regularly need bigger curves: a round tabletop 900 mm across, an arched garden gate, a curved shelf, a circular fire-pit surround. The usual workaround — a nail, a … Read more