box_x = 70;
box_y = 55;
box_z = 16+10+3;
wall_thickness=0.8;
inner_screw=1; // TODO!
gear_distance = 25.2;
gear_thickness = 5;

module outer_old() {
 $fn=50;
 minkowski() {
  cube([box_x,box_y,box_z]);
  cylinder(r=wall_thickness,h=1);
 }
 }
 
module inner_old() {
    $fn=50;
    translate([wall_thickness,wall_thickness,wall_thickness])
    minkowski() {
        cube([box_x-2*wall_thickness,box_y-2*wall_thickness,box_z]);
        cylinder(r=wall_thickness,h=1);
    }
}

module outer() {
    $fn=50;
    cylinder(r=40/2+wall_thickness,h=box_z);
    translate([gear_distance,0,0])    cylinder(r=40/2+wall_thickness,h=box_z);
    translate([0,-(40/2+wall_thickness),0])    cube([gear_distance,40+wall_thickness*2,box_z]);
 }
 
module inner() {
    $fn=50;
    translate([0,0,wall_thickness])    cylinder(r=40/2,h=box_z);
    translate([gear_distance,0,wall_thickness])    cylinder(r=40/2,h=box_z);
    translate([0,-(40/2),box_z-wall_thickness])    cube([gear_distance,40,5]);
}

module servo() {
    $fn=50;
    translate([6,0,0])
    {
    cube([22.5+0.5,12+0.5,33.5-5.5],center=true);    // body
    translate([0,0,28/2-3])    cube([32.5,12.5,2.5],center=true);    // bracket
    translate([-6,0,-14])    cylinder(r=2.8,h=35.5);    // bearing
    translate([27.5/2,0,5])    cylinder(r=inner_screw,h=10);    // screw
    translate([-27.5/2,0,5])    cylinder(r=inner_screw,h=10);    // screw
    translate([-22.5/2-0.6,0,0])    cube([1.2,4,28],center=true);    // cable
    }
}

module space() {
        $fn=50;
    translate([6,0,0])
        //translate([27.5/2,0,28/2-3])    cylinder(r=inner_screw*2.2,h=9);    // place to screw
        translate([0,0,28/2-3+4.5+2.5])    cube([32.5-0.3,12.5,2.5+9],center=true);    // place to screw
}

module servo_bracket() {
     $fn=50;
    minkowski() {
        translate([6,0,3])    cube([22.5+0.5+9-wall_thickness*2,12+0.5-wall_thickness*2,6],center=true);    // body
        cylinder(r=wall_thickness,h=1);
    }
}

module gear_bearing() {
    $fn = 50;
    cylinder(r=10/2,h=6+2.5+1.5+gear_thickness+1.6);
    cylinder(r=5/2,h=box_z-wall_thickness);
}

module lid_screws() {
    $fn = 50;
    translate([gear_distance/2,40/2-2,box_z-8])    cylinder(r=inner_screw,h=8);
    translate([gear_distance/2,-(40/2-2),box_z-8])    cylinder(r=inner_screw,h=8);
}
 
 module box() {
     difference() {
         outer();
         inner();
     }
 }
 
 module rod() {
     translate([20-7.5-16,-100,6+2.5+1.5+gear_thickness*2+1.5])    cube([12+0.8,173.2+0.4,5+0.4+3]);
 }
 
difference() {
    union() {
        box();
        translate([0,0,0])    servo_bracket();
        translate([gear_distance,0,0])    gear_bearing();
    }
    translate([0,0,-4])    servo();
    translate([0,0,-4])    space();
    lid_screws();
    rod();
}
%translate([0,0,-4])    servo();
%rod();
//translate([20,0,box_z-10-wall_thickness]) cube([10,10,10]);