radius = 0.01; height = 0.1; $fn = 50; difference() { difference() { difference() { union() { cylinder(center=false, h=height, r=radius); sphere(radius); }; translate([0, 0, 0.9*height]) rotate_extrude() polygon([[0.8*radius, 0], [1.8*radius, -0.577*radius], [1.8*radius, 0.577*radius]]); } cylinder(center=false, h=1.1*height, r=0.3*radius); } for (i = [1:6]) { rotate([0, 0, 360/6*i]) translate([-1.1*radius, 0.0, -0.2*height]) cylinder(center=false, h=1.1*height, r=0.2*radius); } }