$fn = 64;

// --- Parameters ---
// Overall length of the insert base
insert_length = 100; 

// Overall width of the insert base
insert_width = 60;   

// Total height of the insert base
insert_height = 25;  

// Thickness of the outer walls
wall_thickness = 2;  

// Thickness of the bottom floor
bottom_thickness = 2;

// Outer corner radius (0 for sharp corners)
corner_radius = 4;   

// Bottom edge chamfer (helps with insertion and prevents elephant foot)
bottom_chamfer = 1.5;  

// --- Modules ---

// Helper module to create a rounded rectangular prism
module rounded_prism(l, w, h, r) {
    if (r >= 0.1) {
        hull() {
            translate([r, r, 0]) cylinder(h=h, r=r);
            translate([l-r, r, 0]) cylinder(h=h, r=r);
            translate([l-r, w-r, 0]) cylinder(h=h, r=r);
            translate([r, w-r, 0]) cylinder(h=h, r=r);
        }
    } else {
        cube([l, w, h]);
    }
}

// Main module for the blank insert base
module blank_insert_base() {
    difference() {
        // Outer Body
        hull() {
            // Bottom chamfered face
            translate([bottom_chamfer, bottom_chamfer, 0])
                rounded_prism(
                    insert_length - 2 * bottom_chamfer,
                    insert_width - 2 * bottom_chamfer,
                    0.01, // extremely thin base layer for hull
                    max(0, corner_radius - bottom_chamfer)
                );
            
            // Main body extending upwards
            translate([0, 0, bottom_chamfer])
                rounded_prism(
                    insert_length, 
                    insert_width, 
                    insert_height - bottom_chamfer, 
                    corner_radius
                );
        }

        // Hollow interior for custom inserts
        // Z-height is oversized to ensure a clean manifold cut at the top
        translate([wall_thickness, wall_thickness, bottom_thickness])
            rounded_prism(
                insert_length - 2 * wall_thickness,
                insert_width - 2 * wall_thickness,
                insert_height, 
                max(0, corner_radius - wall_thickness)
            );
    }
}

// --- Render ---
blank_insert_base();