$fn = 100; // number of fragments, a full circle is rendered using this number of fragments


module test_comb(length,width,num,j_x,j_y,step)
{
    difference()
    {
        cube([length,width,3]);
        for(i = [1 : num])
        {
            translate([i * length / num,0,0])
                cube([j_x - (i * step),j_y,3]);
 
        }
        cylinder(3,3,3);
    }
}



projection(cut = true)
    test_comb(100,25,10,3,10,0.05);