pcb_width  = 257.175;
pcb_height =  95.250;
 
radius = 0.5;
$fn    = 72;

/* Lower left rounded corner */
rotate([-90, 90, 90])
    rotate_extrude(angle = 90) {
        intersection() {
            circle(r=radius);
            square(radius*2);
        }
    }
    
/* Lower right rounded corner */
translate([pcb_width, 0, 0])
rotate([270, 0, 0])
linear_extrude(pcb_height)
    intersection() {
        circle(r=radius);
        square(radius*2);
    }
    
/* Upper left rounded corner */
translate([0, pcb_height, 0])
rotate([0, 90, 90])
    rotate_extrude(angle = 90) {
        intersection() {
            circle(r=radius);
            square(radius*2);
        }
    }
    
/* Upper right rounded corner */
translate([pcb_width, pcb_height, 0])
rotate([90, 90, 90])
    rotate_extrude(angle = 90) {
        intersection() {
            circle(r=radius);
            square(radius*2);
        }
    }

/* Left rounded edge */
rotate([270, 90, 0])
linear_extrude(pcb_height)
    intersection() {
        circle(r=radius);
        square(radius*2);
    }
    
/* Bottom rounded edge */
rotate([90, 180, 90])
linear_extrude(pcb_width)
    intersection() {
        circle(r=radius);
        square(radius*2);
    }
    
/* Right rounded edge */
translate([pcb_width, 0, 0])
rotate([180, 90, 90])
    rotate_extrude(angle = 90) {
        intersection() {
            circle(r=radius);
            square(radius*2);
        }
    }
    
    
/* Top rounded edge */
translate([0, pcb_height, 0])
rotate([0, 90, 0])
linear_extrude(pcb_width)
    intersection() {
        circle(r=radius);
        square(radius*2);
    }
      
square([pcb_width, pcb_height], false);