translate([45/2 - 13.5, 10, 0]){
cylinder(r=sonar_sensor_radius, h = sonar_sensor_height, center = true);}
translate([45/2 + 13.5, 10, 0]){
translate([45/2 - 13.5, 10, 0]){
cylinder(r=sonar_sensor_radius, h = sonar_sensor_height, center = true);}
translate([45/2 + 13.5, 10, 0]){