nut_h = 3;
nut_d = 4.15;
nut_r = nut_d / 2;
bolt_d = 3;
bolt_r = bolt_d / 2;

module rounded_cube(dim, radius) {
	range_y = [radius, dim[1]-radius];
	range_z = [radius, dim[2]-radius];
	height = dim[0];

	hull() {
		for (y=range_y, z=range_z) {
			translate([0,y,z]) rotate([0,90,0]) cylinder(r=radius, h=height);
		}
	}
}