calib_plate.scad
$fn=100;

difference() {
    union() {
        translate([7.5,7.5,1])
            cube([85,85,3]);
        cube([100,100,1]);
    }
    union() {
        for (i=[0:7]) {
           translate([15+i*10,15,1])
             cylinder(d=10.25,h=3);
           translate([15+i*10,85,1])
             cylinder(d=10.25,h=3);
           translate([15,15+i*10,1])
             cylinder(d=10.25,h=3);
           translate([85,15+i*10,1])
             cylinder(d=10.25,h=3);
        }
        for (i=[0:7]) {
            for (j=[0:7]) {
                translate([15+i*10,15+j*10,0])
                    cylinder(d=2,h=0.6);
            }
        }
        translate([15,15,1])
            cube([70,70,3]);
    }
}