motor_shaft_radius = 3.7;
motor_shaft_flat_width = 4.8;
-translate([-30, -0.6, 0]){
+translate([-30.4, -1.6, 0]){
+ rim(wheel_radius + 5, 5, 0.4);
+ rim(wheel_radius + 3, 0.4, qr_height + 1);
+
wheel_black(wheel_radius,
wheel_width,
motor_shaft_radius,