// Parametric Toolless U.3 / 3.5" Dual-Mode Drive Caddy
// For 6U Open-Source Storage Array
// Standard Units: Millimeters (mm)

$fn = 64;

// Dimensions
caddy_w = 108.0;
caddy_l = 165.0;
caddy_h = 25.4;
wall_t = 3.0;

hdd_w = 102.0;
hdd_l = 148.0;
hdd_h = 26.1;

// Insert boss dimensions
insert_m3_d = 4.2;
insert_m3_h = 5.0;

module caddy_body() {
    difference() {
        // Outer Shell
        cube([caddy_w, caddy_l, caddy_h]);
        
        // Inner HDD Cavity
        translate([wall_t, 12.0, wall_t])
            cube([caddy_w - 2*wall_t, hdd_l, caddy_h]);
        
        // Bottom Weight-Reduction & Air Vents
        for (i = [0:4]) {
            translate([15.0 + i*16.0, 30.0, -1])
                cube([10.0, 90.0, wall_t + 2]);
        }
        
        // 3.5" HDD Side Pin Pockets (#6-32 standard spacing: 44.45mm and 101.6mm from rear)
        // Rear Datum is at Y = 12.0 + hdd_l = 160.0
        translate([-1, 160.0 - 44.45, caddy_h/2])
            rotate([0, 90, 0])
                cylinder(d=3.8, h=wall_t + 2);
        translate([caddy_w - wall_t - 1, 160.0 - 44.45, caddy_h/2])
            rotate([0, 90, 0])
                cylinder(d=3.8, h=wall_t + 2);
                
        translate([-1, 160.0 - 101.60, caddy_h/2])
            rotate([0, 90, 0])
                cylinder(d=3.8, h=wall_t + 2);
        translate([caddy_w - wall_t - 1, 160.0 - 101.60, caddy_h/2])
            rotate([0, 90, 0])
                cylinder(d=3.8, h=wall_t + 2);
                
        // 2.5" / U.3 SSD Bottom Mounting Holes (M3 Heat-Set Pockets)
        // 2.5" standard: 61.72mm width, 76.60mm length
        translate([caddy_w/2 - 61.72/2, 60.0, -0.5])
            cylinder(d=insert_m3_d, h=insert_m3_h);
        translate([caddy_w/2 + 61.72/2, 60.0, -0.5])
            cylinder(d=insert_m3_d, h=insert_m3_h);
        translate([caddy_w/2 - 61.72/2, 60.0 + 76.6, -0.5])
            cylinder(d=insert_m3_d, h=insert_m3_h);
        translate([caddy_w/2 + 61.72/2, 60.0 + 76.6, -0.5])
            cylinder(d=insert_m3_d, h=insert_m3_h);
            
        // Front Latch Pivot Pin Bore
        translate([8.0, 6.0, -1])
            cylinder(d=3.2, h=caddy_h + 2);
        translate([caddy_w - 8.0, 6.0, -1])
            cylinder(d=3.2, h=caddy_h + 2);
            
        // Optical Light Pipe Tunnel (Ø3.2mm)
        translate([caddy_w/2, -1, caddy_h/2])
            rotate([-90, 0, 0])
                cylinder(d=3.2, h=15.0);
    }
}

caddy_body();