use <soften/hole.scad> use <3d_print/heatset_insert_geometry.scad>
module heatset_insert_hole(size) {
h = heatset_hole_depth(size); d = heatset_hole_diameter(size); stretch_length=0.15; // how much free space in bottom of hole to make hole(h=h*(1+stretch_length), d1=d[0], d2=d[1]+(d[0]-d[1])*stretch_length, top_chamfer=d[0]*0.1);
}