switch box scad design

base.scad

// make a 75wx40dx25h hollow square
height = 25;
width = 75;
depth = 45;
thickness = 2;

// stereo jack/switch mounting holes
hole_diameter = 6;

// width of corner support columns
support_size = 6;

difference() {
    // make outer shell
    difference() {
        // outer shell
        cube(size = [width, depth, height], center = true);
               
        // make cube hollow, with columns for corner supports
        difference() {
            // inner cube 
            cube(size = [width - thickness, depth - thickness, height - thickness], center = true);
            
            // but leave corner supports
            translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);
        
            translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);

            translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);

            translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);
        }
        
        // cut out right side holes: 6mm diameter
        rotate([90, 0, 0])
        translate([15,0,0])
        cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true);
        
        // cut out left side holes: 6mm diameter
        rotate([90, 0, 0])
        translate([-15,0,0])
        cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true); 
        
        // cut out screw holes in top and into top part of supports
        translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true);
       
       translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true);
       
       translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true); 
       
       translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
        cylinder(h=height/2, r1=2, r2=2, center=true);
    }
    
    // subtract top 2mm
    translate([0, 0, height - 2])
        cube(size = [width, depth, height], center = true);
}

top.scad

// make a 75wx40dx25h hollow square
height = 25;
width = 75;
depth = 45;
thickness = 2;

// stereo jack/switch mounting holes
hole_diameter = 6;

// width of corner support columns
support_size = 6;

difference() {
    // make outer shell
    difference() {
        // outer shell
        cube(size = [width, depth, height], center = true);
               
        // make cube hollow, with columns for corner supports
        difference() {
            // inner cube 
            cube(size = [width - thickness, depth - thickness, height - thickness], center = true);
            
            // but leave corner supports
            translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);
        
            translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);

            translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);

            translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
                cube(size = [support_size, support_size, height], center = true);
        }
        
        // cut out right side holes: 6mm diameter
        rotate([90, 0, 0])
        translate([15,0,0])
        cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true);
        
        // cut out left side holes: 6mm diameter
        rotate([90, 0, 0])
        translate([-15,0,0])
        cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true); 
        
        // cut out screw holes in top and into top part of supports
        translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true);
       
       translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true);
       
       translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
            cylinder(h=height/2, r1=2, r2=2, center=true); 
       
       translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
        cylinder(h=height/2, r1=2, r2=2, center=true);
    }
    
    // subtract all but top 2mm
    translate([0, 0, -2])
        cube(size = [width, depth, height - 2], center = true);
}

whole.scad

// make a 75wx40dx25h hollow square
height = 25;
width = 75;
depth = 45;
thickness = 2;

// stereo jack/switch mounting holes
hole_diameter = 6;

// width of corner support columns
support_size = 6;
    
// make outer shell
difference() {
    // outer shell
    cube(size = [width, depth, height], center = true);
           
    // make cube hollow, with columns for corner supports
    difference() {
        // inner cube 
        cube(size = [width - thickness, depth - thickness, height - thickness], center = true);
        
        // but leave corner supports
        translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
            cube(size = [support_size, support_size, height], center = true);
    
        translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 0])
            cube(size = [support_size, support_size, height], center = true);

        translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
            cube(size = [support_size, support_size, height], center = true);

        translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 0])
            cube(size = [support_size, support_size, height], center = true);
    }
    
    // cut out right side holes: 6mm diameter
    rotate([90, 0, 0])
    translate([15,0,0])
    cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true);
    
    // cut out left side holes: 6mm diameter
    rotate([90, 0, 0])
    translate([-15,0,0])
    cylinder(h=depth, r1=hole_diameter, r2=hole_diameter, center=true); 
    
    // cut out screw holes in top and into top part of supports
    translate([((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
        cylinder(h=height/2, r1=2, r2=2, center=true);
   
   translate([-((width / 2.0) - thickness * 2), ((depth / 2.0) - thickness * 2), 10])
        cylinder(h=height/2, r1=2, r2=2, center=true);
   
   translate([((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
        cylinder(h=height/2, r1=2, r2=2, center=true); 
   
   translate([-((width / 2.0) - thickness * 2), -((depth / 2.0) - thickness * 2), 10])
    cylinder(h=height/2, r1=2, r2=2, center=true);
}