// -*- C -*- $hinge_pin_dia = 0.795 + 0.35; $hinge_main_dia = 4.0; $hinge_inter_gap = 0.50; $hinge_noncrit_gap = 1.0; $fa = 3; $fs = 0.05; module HingeProngPlan(behind){ difference(){ hull(){ circle(r= $hinge_main_dia/2); polygon([[0,0], [-$hinge_main_dia/2, -behind], [+$hinge_main_dia/2, -behind]]); } circle(r= $hinge_pin_dia/2); } } HingeProngPlan(5);