2d3d/3D/turm.scad

x=50;

c = [30,4,4];

difference() {
    union() {
        for ( i = [ 0 : 1 : x]) {
            rotate([0, 0, i*360/x]) translate([0, 0, i*c.z]) cube(c);
        }
    }
    translate([0,0,-c.z]) cylinder(d=c.x, h=(x+3)*c.z);
}