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);

}