- translate([0, 0, -eps])
- cylinder(r = center_hole_d/2, h = thick + 2*eps, $fn = 128);
+ if (center_hole_d2 > 0) {
+ translate([0, 0, 0.5])
+ cylinder(r1 = center_hole_d/2, r2 = center_hole_d/2+0.2, h = thick + 2*eps, $fn = 8);
+ translate([0, 0, -eps])
+ cylinder(r = center_hole_d2/2, h = thick + 2*eps, $fn = 128);
+ } else {
+ translate([0, 0, -eps])
+ cylinder(r = center_hole_d/2, h = thick + 2*eps, $fn = 128);
+ }