+module wheel_solid(radius,
+ width,
+ shaft_radius,
+ shaft_flat_width,
+ wall_width,
+ tread_radius){
+ difference(){
+ rim(radius, wall_width * 2, width);
+ translate([0, 0, width / 2]){
+ tread(radius, tread_radius);}}
+ linear_extrude(height = qr_height){
+ difference (){
+ square(qr_size, center = true);
+ mounting_screw_flat(); } }
+ translate([0, 0, qr_height]){
+ motor_shaft_holder(shaft_radius,
+ shaft_flat_width,
+ wall_width,
+ width - qr_height);}}
+
+/*