round_psu_cable_fan_plane(300, 200, 5, 20, 20, 10, 40, 90, 90, 90);
RESOLUTION=36;

/*
 * Simple, base angular plane with four holes
 */
module base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y) {
    difference() {
        // base square
        square([width, height]);
        
        // holes
        translate([hole_spacing_x, hole_spacing_y])
        circle(d=hole_size, $fn=RESOLUTION);
        translate([width - hole_spacing_x, hole_spacing_y])
        circle(d=hole_size, $fn=RESOLUTION);
        translate([hole_spacing_x, height - hole_spacing_y])
        circle(d=hole_size, $fn=RESOLUTION);
        translate([width - hole_spacing_x, height - hole_spacing_y])
        circle(d=hole_size, $fn=RESOLUTION);
    }
}

/*
 * base_plane(...) with rounded edges, using helper function __radius_cutout(...)
 */
module round_base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius) {
    intersection() {
        base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y);
        __round_square(width, height, radius);
    }
}

/*
 * Rounded base plane with cutout for the PSU
 */
module round_psu_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, psu_width, psu_height) {
   difference() {
       round_base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius);

       translate([width-psu_width, height/2-psu_height/2])
       square([psu_width, psu_height]);
   }
}

/*
 * Rounded base plane with cutout for cables
 */
module round_cable_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, cable_width, cable_height) {
   difference() {
       round_base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius);

       difference() {
           union() {
                translate([0, height/2-cable_height/2])
                square([cable_width, cable_height]);

                // Outer rounds
                translate([radius, height/2-cable_height/2-radius])
                rotate([0, 0, 90])
                __radius_cutout(radius);
                translate([radius, height/2+cable_height/2+radius])
                rotate([0, 0, 180])
                __radius_cutout(radius);
           }

           // Inner rounds
           translate([cable_width-radius, height/2+cable_height/2-radius])
           __radius_cutout(radius);
           translate([cable_width-radius, height/2-cable_height/2+radius])
           rotate([0, 0, 270])
           __radius_cutout(radius);
       }
   }
}

/*
 * Base plane with combined cutouts: for PSU and for cables
 */
module round_psu_cable_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, psu_width, psu_height, cable_width, cable_height) {
    intersection() {
        round_psu_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, psu_width, psu_height);
        round_cable_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, cable_width, cable_height);
    }
}

/*
 * Base plane with cutouts for two fans in the center
 */
module round_fan_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius) {
    difference() {
        round_base_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius);

        // lower fan
        translate([width/2-120/2, height/4-120/2])
        __fan_cutout(120, 105, 5);
        // upper fan
        translate([width/2-120/2, height*3/4-120/2])
        __fan_cutout(120, 105, 5);
    }
}

/*
 * Base plane with cutouts for psu, cables and fans
 */
module round_psu_cable_fan_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, psu_width, psu_height, cable_width, cable_height) {
    intersection() {
        round_psu_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, psu_width, psu_height);
        round_cable_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius, cable_width, cable_height);
        round_fan_plane(width, height, hole_size, hole_spacing_x, hole_spacing_y, radius);
    }
}

/*
 * Helper function for round edges
 */
module __radius_cutout(radius) {  
    difference() {
        translate([radius/2, radius/2, 0])
        square([radius, radius], center=true);
        circle(radius, $fn=RESOLUTION);
    }    
}

/*
 * Helper function for square with round edges
 */
module __round_square(width, height, radius) {
    difference() {
        square([width, height]);
        translate([width-radius, height-radius])
        __radius_cutout(radius);
        translate([radius, height-radius])
        rotate([0, 0, 90])
        __radius_cutout(radius);
        translate([radius, radius])
        rotate([0, 0, 180])
        __radius_cutout(radius);
        translate([width-radius, radius])
        rotate([0, 0, 270])
        __radius_cutout(radius);
    }
}

/*
 * Helper function for fan cutout
 */
module __fan_cutout(outer_size, inner_size, bearing_size) {
    // Bearing
    translate([outer_size-(outer_size-inner_size)/2, outer_size-(outer_size-inner_size)/2])
    circle(d=bearing_size);
    translate([(outer_size-inner_size)/2, outer_size-(outer_size-inner_size)/2])
    circle(d=bearing_size);
    translate([outer_size-(outer_size-inner_size)/2, (outer_size-inner_size)/2])
    circle(d=bearing_size);
    translate([(outer_size-inner_size)/2, (outer_size-inner_size)/2])
    circle(d=bearing_size);
    echo(outer_size-(outer_size-inner_size)/2);
    echo((outer_size-inner_size)/2);

    // middle squares
    translate([0, outer_size-inner_size, 0])
    __round_square(outer_size, inner_size-(outer_size-inner_size), 5);
    translate([outer_size-inner_size, 0, 0])
    __round_square(inner_size-(outer_size-inner_size), outer_size, 5);

    // round edges between middle squares
    translate([outer_size-inner_size-2.5, outer_size-inner_size-2.5, 0])
    __radius_cutout(2.5);

    translate([outer_size-(outer_size-inner_size)+2.5, outer_size-inner_size-2.5, 0])
    rotate([0, 0, 90])
    __radius_cutout(2.5);

    translate([outer_size-(outer_size-inner_size)+2.5, outer_size-(outer_size-inner_size)+2.5, 0])
    rotate([0, 0, 180])
    __radius_cutout(2.5);

    translate([outer_size-inner_size-2.5, outer_size-(outer_size-inner_size)+2.5, 0])
    rotate([0, 0, 270])
    __radius_cutout(2.5);

}