[fiddlecad] B550M-C Motherboard IO Shield

model.scad

// ============================================================
// Parametric Motherboard I/O Shield — Gigabyte B550M-C style
// ============================================================

/* [Overall Dimensions] */
// Outer width (ATX standard ≈ 158.75)
width = 158.75; // [120:0.25:180]
// Outer height (ATX standard ≈ 44.45)
height = 44.45; // [35:0.25:55]
// Face plate thickness
thickness = 0.8; // [0.5:0.1:1.5]
// Depth of the folded mounting flanges
flange_depth = 6; // [3:0.5:12]
// Flange wall thickness
flange_thickness = 0.8; // [0.4:0.1:1.5]
// Outer corner radius
corner_r = 1.2; // [0:0.2:3]
// Inset of the dark face panel from the outer flange lip
face_inset = 1.8; // [0.5:0.1:4]

/* [Port sizing] */
// USB Type-A cutout width
usb_w = 14; // [10:0.5:18]
// USB Type-A cutout height
usb_h = 6.2; // [4:0.5:9]
// Generic rectangle corner radius (cutouts)
rect_r = 0.7; // [0:0.1:2]
// Circle fragments
$fn = 64;

/* [Left section] */
// Show VGA / D-Sub silhouette
show_vga = true;
vga_w = 17.5; // [12:0.5:28]
vga_h = 8.5; // [6:0.5:14]
// X from left of face (center)
vga_x = 12; // [6:0.5:30]
vga_y = 9.5; // [5:0.5:25]

// Stacked USB (top-left)
show_usb_stack = true;
usb_stack_x = 27; // [15:0.5:50]
// Y of the gap between the two USBs
usb_stack_mid_y = 29; // [18:0.5:40]
usb_stack_gap = 2.2; // [0.5:0.5:6]

// Large circular hole under USBs
show_ps2 = true;
ps2_d = 14.5; // [8:0.5:22]
ps2_x = 27; // [15:0.5:50]
ps2_y = 10.5; // [5:0.5:25]

/* [Mid-left double rect] */
show_display_out = true;
// Often HDMI / DP pair
disp_w = 13; // [8:0.5:20]
disp_h = 5.8; // [3:0.5:10]
disp_x = 46; // [30:0.5:70]
disp_mid_y = 16; // [8:0.5:35]
disp_gap = 2.2; // [0.5:0.5:6]

/* [Center USB + LAN stack] */
show_center = true;
// Top / mid USB-style
cen_usb_w = 14; // [10:0.5:18]
cen_usb_h = 6.5; // [4:0.5:10]
// Bottom (RJ-45 LAN typically taller)
cen_lan_w = 15.5; // [12:0.5:22]
cen_lan_h = 12; // [8:0.5:18]
cen_gap = 1.6; // [0.5:0.5:5]
cen_x = 70; // [50:0.5:100]
// Y of midpoint of the three-stack
cen_mid_y = 22; // [12:0.5:35]

/* [Audio optical pair / SPDIF] */
show_circles = true;
c_d = 9.5; // [5:0.5:16]
c_x = 95; // [70:0.5:120]
// Y of gap between the two circles
c_mid_y = 26; // [12:0.5:38]
c_pitch = 12.5; // [8:0.5:20]

/* [Right mixed rects] */
show_right_rects = true;
// Upper horizontal slot
rr_slot_w = 15; // [8:0.5:24]
rr_slot_h = 5.5; // [3:0.5:10]
rr_slot_x = 115; // [90:0.5:140]
rr_slot_y = 28.5; // [15:0.5:40]
// Two lower stacked rects
rr_w = 12; // [6:0.5:18]
rr_h = 5.5; // [3:0.5:10]
rr_x = 115; // [90:0.5:140]
rr_mid_y = 13; // [6:0.5:28]
rr_gap = 2; // [0.5:0.5:5]

/* [Far-right audio jacks] */
show_audio = true;
// Number of stacked 3.5mm jacks
audio_n = 4; // [2:1:6]
audio_d = 7.8; // [4:0.5:12]
audio_x = 139; // [110:0.5:155]
// Y of lowest jack center
audio_y0 = 8; // [4:0.5:18]
// Pitch between jack centers
audio_pitch = 8.8; // [5:0.5:14]

/* [Label text] */
show_label = true;
label_text = "B550M-C";
label_size = 3.5; // [2:0.1:8]
// Depth of debossed label
label_depth = 0.3; // [0.05:0.05:0.8]
label_x = 8; // [2:0.5:40]
label_y = 32; // [15:0.5:42]

// ============================================================
// Derived
// ============================================================
face_w = width - 2 * face_inset;
face_h = height - 2 * face_inset;

// ============================================================
// Primitives
// ============================================================
module round_rect_2d(w, h, r) {
    r2 = min(r, w / 2 - 0.01, h / 2 - 0.01);
    if (r2 <= 0)
        square([w, h], center = true);
    else
        offset(r = r2)
        offset(r = -r2)
        square([w, h], center = true);
}

module rounded_box(w, h, t, r) {
    linear_extrude(t)
    round_rect_2d(w, h, r);
}

// VGA / D-Sub silhouette (truncated hexagon)
module vga_2d(w, h) {
    // Classic D-sub silhouette — flat top/bottom with tapered sides
    chamfer = min(2.2, h * 0.35);
    ster = min(1.4, w * 0.08);
    polygon([
        [-w/2 + ster, -h/2],
        [ w/2 - ster, -h/2],
        [ w/2,        -h/2 + chamfer],
        [ w/2,         h/2 - chamfer],
        [ w/2 - ster,  h/2],
        [-w/2 + ster,  h/2],
        [-w/2,         h/2 - chamfer],
        [-w/2,        -h/2 + chamfer]
    ]);
}

// ============================================================
// Face cutouts. Origin at face bottom-left; Z upward through plate.
// ============================================================
module face_ports() {
    // USB stack
    if (show_usb_stack) {
        translate([usb_stack_x, usb_stack_mid_y + usb_stack_gap/2 + usb_h/2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(usb_w, usb_h, rect_r);
        translate([usb_stack_x, usb_stack_mid_y - usb_stack_gap/2 - usb_h/2, 0])
            linear_extrude(thickness + 2)
            round_rect_2d(usb_w, usb_h, rect_r);
    }

    // PS/2 / large circle under stack
    if (show_ps2)
        translate([ps2_x, ps2_y, 0])
        cylinder(h = thickness + 2, d = ps2_d);

    // VGA silhouette
    if (show_vga)
        translate([vga_x, vga_y, 0])
        linear_extrude(thickness + 2)
            vga_2d(vga_w, vga_h);

    // Display outs (double rect)
    if (show_display_out) {
        translate([disp_x, disp_mid_y + disp_gap/2 + disp_h/2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(disp_w, disp_h, rect_r);
        translate([disp_x, disp_mid_y - disp_gap/2 - disp_h/2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(disp_w, disp_h, rect_r);
    }

    // Center USB/USB/LAN
    if (show_center) {
        stack_h = cen_usb_h * 2 + cen_lan_h + 2 * cen_gap;
        y0 = cen_mid_y - stack_h / 2;
        // LAN bottom
        translate([cen_x, y0 + cen_lan_h / 2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(cen_lan_w, cen_lan_h, rect_r + 0.2);
        // middle USB
        translate([cen_x, y0 + cen_lan_h + cen_gap + cen_usb_h / 2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(cen_usb_w, cen_usb_h, rect_r);
        // top USB
        translate([cen_x, y0 + cen_lan_h + cen_gap + cen_usb_h + cen_gap + cen_usb_h / 2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(cen_usb_w, cen_usb_h, rect_r);
    }

    // Circle pair
    if (show_circles) {
        translate([c_x, c_mid_y + c_pitch / 2, 0])
        cylinder(h = thickness + 2, d = c_d);
        translate([c_x, c_mid_y - c_pitch / 2, 0])
        cylinder(h = thickness + 2, d = c_d);
    }

    // Right rects
    if (show_right_rects) {
        translate([rr_slot_x, rr_slot_y, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(rr_slot_w, rr_slot_h, rect_r + 0.4);
        translate([rr_x, rr_mid_y + rr_gap/2 + rr_h/2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(rr_w, rr_h, rect_r);
        translate([rr_x, rr_mid_y - rr_gap/2 - rr_h/2, 0])
        linear_extrude(thickness + 2)
            round_rect_2d(rr_w, rr_h, rect_r);
    }

    // Audio jacks
    if (show_audio) {
        for (i = [0 : audio_n - 1]) {
            translate([audio_x, audio_y0 + i * audio_pitch, 0])
            cylinder(h = thickness + 2, d = audio_d);
        }
    }

    // Debossed label (as a shallow cut from front)
    if (show_label) {
        translate([label_x, label_y, thickness - label_depth])
        linear_extrude(label_depth + 0.1)
        text(label_text, size = label_size,
             font = "Liberation Sans:style=Bold",
             valign = "center", halign = "left", $fn = 24);
    }
}

// ============================================================
// Body: face plate + 4-sided flange
// ============================================================
module flange_frame() {
    // Outer wall of flange
    difference() {
        // outer
        translate([0, 0, -flange_depth])
        rounded_box(width, height, flange_depth + thickness * 0.5, corner_r);

        // hollow out interior
        translate([0, 0, -flange_depth - 0.1])
        rounded_box(
            width - 2 * flange_thickness,
            height - 2 * flange_thickness,
            flange_depth + 0.2,
            max(0.1, corner_r - flange_thickness)
        );

        // open the front (keep only the flange “walls”)
        // keep a thin rim
        translate([0, 0, -0.05])
        rounded_box(
            face_w,
            face_h,
            thickness + 0.2,
            max(0.1, corner_r - face_inset)
        );
    }
}

module face_plate() {
    rounded_box(face_w, face_h, thickness, max(0.1, corner_r - face_inset * 0.4));
}

module io_shield() {
    difference() {
        union() {
            flange_frame();
            // Face plate sits flush at Z = 0 (front)
            face_plate();
        }

        // Cut ports through face (origin shifted to face bottom-left)
        translate([-face_w / 2, -face_h / 2, -0.5])
        face_ports();
    }
}

// Render — brushed metal look
color([0.75, 0.76, 0.78])
io_shield();

model.stl

screenshot.png