$fn=64;

// --- Parameters ---
strip_width = 16.5;      // Width of the LED strip or aluminum channel
strip_thickness = 10.0;  // Height/thickness of the strip
wall_thickness = 3.0;    // Thickness of the mount's walls and base
length = 15.0;           // Length of the mount
lip_radius = 1.0;        // Size of the snap-fit retention lip
screw_dia = 3.5;         // Diameter of the mounting screw (e.g., M3 or #6)
screw_head_dia = 7.0;    // Diameter of the screw head
countersink_depth = 1.8; // Depth of the screw countersink

// --- Calculated Variables ---
outer_w = strip_width + (wall_thickness * 2);
outer_h = strip_thickness + wall_thickness;

// --- Model ---
difference() {
    // Main Body with Lips
    union() {
        // Base and walls
        difference() {
            // Outer block
            translate([0, 0, outer_h/2])
                cube([outer_w, length, outer_h], center=true);

            // Inner channel cutout
            translate([0, 0, wall_thickness + strip_thickness/2 + 0.1])
                cube([strip_width, length + 0.2, strip_thickness + 0.2], center=true);
        }

        // Left snap-fit lip
        translate([-strip_width/2, 0, outer_h - lip_radius])
            rotate([90, 0, 0])
            cylinder(r=lip_radius, h=length, center=true);

        // Right snap-fit lip
        translate([strip_width/2, 0, outer_h - lip_radius])
            rotate([90, 0, 0])
            cylinder(r=lip_radius, h=length, center=true);
    }

    // Screw hole (shaft)
    translate([0, 0, -0.1])
        cylinder(h=wall_thickness + 0.2, d=screw_dia);

    // Screw hole (countersink from the inside)
    translate([0, 0, wall_thickness + 0.1])
        rotate([180, 0, 0])
        cylinder(h=countersink_depth + 0.1, d1=screw_head_dia, d2=screw_dia);
}