How to create a pottery stamp using openSCAD for 3d printing

stamp.scad

use <chamfer_extrude.scad>

// declare the height and radius of the cylinder supporting the stamp
cylinder_height = 20;
cylinder_radius = 10;

// move the stamp so that it is in the centre of the cylinder
translate([-1.3, 0.2, cylinder_height])
// scale the stamp so that it fits on the cylinder
scale([0.2, 0.2, 0.4])

// extrude the stamp, turning the 2d image into a 
// beveled cutting surface
chamfer_extrude(height=10, angle=15, $fn=16)
    projection(cut=true){
        rotate([0, 180, 0])
        // import "stamp.png", which is a .png of the stamp
        surface(file="stamp.png", center=true, invert=true);
    }

// render the supporting cylinder    
cylinder(cylinder_height, cylinder_radius, cylinder_radius);