Large Drawing Compass

prusaprinters

<p>This compass will allow drawing arcs and circles up to 40" or 1 meter in diameter.</p><p>Additional parts required are, 1 @ standard pencil, 1 @ ¼" or equivalent bolt, 1 @ nut to fit (system is designed for ¼ x 20 bolt and nut), &nbsp;1 @ #8 or equivalent 3 inch wood screw (I used a deck screw). &nbsp;</p><p>It is suggested to print with 4 or more perimeters for best strength and to allow slight enlargement of holes if needed. &nbsp;Normally .20mm layer height is adequate.</p><p>Supports are only suggested for nut insert holes if parts are printed in orientation shown.</p><p>Bottom halves should be glued to the arms using the joiners for strength and alignment. &nbsp;Remember to print 2 joiners.</p><p>2 types of knobs for tightening on the pivot point are provided. &nbsp;The round style is shown in the photo. &nbsp;I prefer the triangular style. &nbsp;</p><p>Since PLA is inherrently slippery I will be looking into some thin higher friction material to place between the sliding surfaces of the arms to reduce the torque required for tightening.</p><p>I suggest inserting the shim to hold the pencil from the bottom. &nbsp;This will be more effective for keeping the pencil from sliding upwards during use and allow the pencil to be repositioned by pushing the pencil downwards.</p><p>&nbsp;</p>