$fn=64;

// --- Parameters ---
// Outer dimensions of the display frame
width = 200;
depth = 150;
height = 250;

// Frame structure properties
frame_thickness = 6;
border_width = 15;

// Acrylic panel fitment
acrylic_thickness = 3;
lip_width = 5; // How much the frame overlaps the acrylic on the inside

module dust_cover_frame() {
    difference() {
        // Main outer block
        cube([width, depth, height]);

        // Hollow interior (open at the bottom)
        translate([frame_thickness, frame_thickness, -0.1])
            cube([
                width - 2*frame_thickness, 
                depth - 2*frame_thickness, 
                height - frame_thickness + 0.1
            ]);

        // Front Window
        window_cutout(
            pos = [border_width, -0.1, border_width],
            size = [width - 2*border_width, frame_thickness + 0.2, height - 2*border_width],
            recess_pos = [border_width - lip_width, frame_thickness - acrylic_thickness, border_width - lip_width],
            recess_size = [width - 2*border_width + 2*lip_width, acrylic_thickness + 0.1, height - 2*border_width + 2*lip_width]
        );

        // Back Window
        window_cutout(
            pos = [border_width, depth - frame_thickness - 0.1, border_width],
            size = [width - 2*border_width, frame_thickness + 0.2, height - 2*border_width],
            recess_pos = [border_width - lip_width, depth - frame_thickness - 0.1, border_width - lip_width],
            recess_size = [width - 2*border_width + 2*lip_width, acrylic_thickness + 0.1, height - 2*border_width + 2*lip_width]
        );

        // Left Window
        window_cutout(
            pos = [-0.1, border_width, border_width],
            size = [frame_thickness + 0.2, depth - 2*border_width, height - 2*border_width],
            recess_pos = [frame_thickness - acrylic_thickness, border_width - lip_width, border_width - lip_width],
            recess_size = [acrylic_thickness + 0.1, depth - 2*border_width + 2*lip_width, height - 2*border_width + 2*lip_width]
        );

        // Right Window
        window_cutout(
            pos = [width - frame_thickness - 0.1, border_width, border_width],
            size = [frame_thickness + 0.2, depth - 2*border_width, height - 2*border_width],
            recess_pos = [width - frame_thickness - 0.1, border_width - lip_width, border_width - lip_width],
            recess_size = [acrylic_thickness + 0.1, depth - 2*border_width + 2*lip_width, height - 2*border_width + 2*lip_width]
        );

        // Top Window
        window_cutout(
            pos = [border_width, border_width, height - frame_thickness - 0.1],
            size = [width - 2*border_width, depth - 2*border_width, frame_thickness + 0.2],
            recess_pos = [border_width - lip_width, border_width - lip_width, height - frame_thickness - 0.1],
            recess_size = [width - 2*border_width + 2*lip_width, depth - 2*border_width + 2*lip_width, acrylic_thickness + 0.1]
        );
    }
}

// Helper module to cut the window and its inner recess for the acrylic panel
module window_cutout(pos, size, recess_pos, recess_size) {
    // Main window cutout (through the frame)
    translate(pos) cube(size);
    // Inner recess (lip) to hold the acrylic panel
    translate(recess_pos) cube(recess_size);
}

// Render the frame
// Note: For optimal 3D printing, rotate 180 degrees around the X or Y axis 
// so the solid top face rests completely flat on the build plate.
dust_cover_frame();