$fn = 64;

// --- Parameters ---
bin_wall_thickness = 5.0;    // Thickness of the bin lip/wall
hook_width = 15.0;           // Total width of the hook (extrusion height)
material_thickness = 4.0;    // Thickness of the plastic structure
inside_clip_depth = 25.0;    // How far the clip extends inside the bin
outside_drop = 30.0;         // How far down the hook goes on the outside
hook_depth = 18.0;           // How far the hook protrudes outward
hook_lip_height = 12.0;      // Height of the front retention lip
corner_radius = 1.0;         // Radius for smoothing all sharp edges

// --- Model ---
// Rotated to lay flat on the print bed for optimal strength and no supports
rotate([90, 0, 0])
linear_extrude(height=hook_width, center=true)
// This combination of offsets perfectly rounds all inside and outside corners 
// without altering the overall dimensions of the part.
offset(r=-corner_radius) offset(r=2*corner_radius) offset(r=-corner_radius)
difference() {
    union() {
        // Inside leg (goes inside the bin)
        translate([-bin_wall_thickness - material_thickness, -inside_clip_depth])
            square([material_thickness, inside_clip_depth + material_thickness]);

        // Top bridge (rests on top of the bin wall)
        translate([-bin_wall_thickness - material_thickness, 0])
            square([bin_wall_thickness + 2 * material_thickness, material_thickness]);

        // Outside leg (goes down the outside of the bin)
        translate([0, -outside_drop])
            square([material_thickness, outside_drop + material_thickness]);

        // Hook base (extends outward)
        translate([0, -outside_drop])
            square([material_thickness + hook_depth, material_thickness]);

        // Hook lip (points upward to retain items)
        translate([hook_depth, -outside_drop])
            square([material_thickness, hook_lip_height]);
    }

    // Lead-in chamfer on the inside leg to make it easier to slide onto the bin
    translate([-bin_wall_thickness, -inside_clip_depth])
        polygon([[1, -1], [-3, -1], [1, 5]]);
}