OpenSCAD parametric flat heart

heart.scad

module heart(size, thickness) {
  middle = size / 2;
  linear_extrude(thickness) {
    square(size);
    translate([size, middle, 0]) circle(middle);
    translate([middle, size, 0]) circle(middle);
  }
}

// Use it like this :
// heart(20, 5);