$fn = 64;

// --- Parameters ---
base_width = 90;
base_depth = 50;
base_height_front = 35;
base_height_back = 45;
corner_radius = 5;

// Utility knife (e.g., standard Stanley knife)
utility_slot_width = 35;
utility_slot_depth = 12;
utility_cut_depth = 38;

// Hobby knives (e.g., X-Acto knives)
hobby_slot_diameter = 12;
hobby_cut_depth = 38;

module safe_knife_holder() {
    difference() {
        // Main body with an ergonomic slanted top
        hull() {
            // Front corners
            for (x = [corner_radius, base_width - corner_radius]) {
                translate([x, corner_radius, 0]) 
                    cylinder(r=corner_radius, h=base_height_front);
            }
            // Back corners
            for (x = [corner_radius, base_width - corner_radius]) {
                translate([x, base_depth - corner_radius, 0]) 
                    cylinder(r=corner_radius, h=base_height_back);
            }
        }

        // Utility knife slot (Left side)
        // Extends well above the top to ensure a clean boolean cut
        translate([28 - utility_slot_width/2, base_depth/2 - utility_slot_depth/2, base_height_back - utility_cut_depth])
            cube([utility_slot_width, utility_slot_depth, base_height_back + 10]);

        // Hobby knife slot 1 (Right side, back)
        translate([68, base_depth/2 + 10, base_height_back - hobby_cut_depth])
            cylinder(d=hobby_slot_diameter, h=base_height_back + 10);

        // Hobby knife slot 2 (Right side, front)
        translate([68, base_depth/2 - 10, base_height_back - hobby_cut_depth])
            cylinder(d=hobby_slot_diameter, h=base_height_back + 10);
    }
}

// Render the model
safe_knife_holder();