module filleted_cylinder(
    cylinder_height=2,
    cylinder_radius=1,
    fillet_radius_bottom=1,
    fillet_radius_top=0,
    nfaces=50
) {
    /* created by Kevin Lam on Dec 3, 2016 */
    union() {      
        cylinder(cylinder_height, r=cylinder_radius, $fn=nfaces, false);
        
        if (fillet_radius_bottom > 0) {
            difference() {
                cylinder(fillet_radius_bottom, r=cylinder_radius+fillet_radius_bottom, $fn=nfaces, false);
                translate([0, 0, fillet_radius_bottom])
                rotate_extrude($fn=nfaces)
                translate([cylinder_radius+fillet_radius_bottom, 0, 0])
                circle(fillet_radius_bottom, $fn=nfaces);
            }
        }
        
        if (fillet_radius_top>0) {
            difference() {
                translate([0,0,cylinder_height-fillet_radius_top])
                cylinder(fillet_radius_top, r=cylinder_radius+fillet_radius_top, $fn=nfaces, false);
                
                translate([0, 0, cylinder_height-fillet_radius_top])
                rotate_extrude($fn=nfaces)
                translate([cylinder_radius+fillet_radius_top, 0, 0])
                circle(fillet_radius_top, $fn=nfaces);
            }
        }
    }
}