ksmithdev

$fn=10;
union() {
    difference() {
        cylinder(h=4, r=12.5, center=false);
        cylinder(h=1, r=10.5, center=false);
        
        translate([0,0,3])
            cylinder(h=1, r=10.5, center=false);
    }

ksmithdev

layer_height = 0.2;
model_height = 1;

union() {
    for (i=[0:layer_height:model_height]) {
        translate([0,0,i])
            linear_extrude(layer_height)
                offset(-i*0.6)
                    resize([10,10,layer_height])
                        import("Symbol.svg", center = true);