$fn=64;

// --- Parameters ---
// Overall Dimensions
holder_width = 85;
holder_depth = 35;
holder_height = 65;
wall_thickness = 4;

// Utility Knife Slot
uk_width = 35;
uk_depth = 18;

// X-Acto Knife Slots
xacto_dia = 14;
xacto_count = 2;
xacto_spacing = 20;

// ArtArsenal / Wall Rail Mount (French Cleat style)
cleat_depth = 6;
cleat_height = 15;

// --- Geometry ---
union() {
    // Main Body
    difference() {
        // Base Block
        cube([holder_width, holder_depth, holder_height]);

        // Utility Knife Cutout (Deep slot for protection)
        translate([wall_thickness, wall_thickness, wall_thickness])
            cube([uk_width, uk_depth, holder_height]);

        // X-Acto Knife Cutouts (Round holes for safe blade storage)
        for(i = [0 : xacto_count - 1]) {
            translate([
                wall_thickness * 2 + uk_width + xacto_dia/2 + (i * xacto_spacing),
                holder_depth / 2 - 2,
                wall_thickness
            ])
            cylinder(h=holder_height, d=xacto_dia);
        }

        // Easy-Access Front Chamfer (Sloped cut for easier grabbing)
        translate([-1, -10, holder_height - 15])
            rotate([-30, 0, 0])
            cube([holder_width + 2, holder_depth + 20, 50]);
    }

    // Rail Mount (Back)
    translate([0, holder_depth - 0.1, holder_height - cleat_height])
        rotate([90, 0, 90])
        linear_extrude(holder_width)
        polygon([
            [0, 0],
            [cleat_depth, cleat_depth],
            [cleat_depth, cleat_height],
            [0, cleat_height]
        ]);
}