height = 25;
sides = 5;
kerf = 0.15;
fit = 2.5;
length = 10;
totallength = length * 2;


points = [ for (i = [0:sides]) point(height, 360 * i / sides)];

function point(rad, angle) = [height * cos(angle), height * sin(angle)];

difference(){
polygon(points);

r = height; // pattern radius
n = sides; // number of holes
step = 360/n;
for (i=[0:step:360]) {
    angle = i;
    dx = r*cos(angle);
    dy = r*sin(angle);
    translate([dx,dy,0])
    rotate([0,0,angle])
    square([totallength,fit-kerf],center = true);    
}

}