$fn=64;

// --- Parameters ---
// Standard metric Allen key sizes
keys = [1.5, 2.0, 2.5, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0];

tolerance = 0.6; // Clearance for easy insertion
spacing = 7;     // Gap between holes
wall = 4;        // Minimum wall thickness
base_h = 4;      // Solid base thickness under the holes

// Calculate X positions for each key recursively
function x_pos(i) = i == 0 ? 0 : x_pos(i-1) + (keys[i-1] + keys[i])/2 + spacing;

// Pre-calculate dimensions
max_key = keys[len(keys)-1];
depth = max_key + wall * 2;
length = x_pos(len(keys)-1);

difference() {
    // Main slanted body
    hull() {
        // Small end
        translate([-keys[0]/2 - wall, -depth/2, 0])
            cube([keys[0] + wall*2, depth, 15]);
        // Large end
        translate([length - max_key/2 - wall, -depth/2, 0])
            cube([max_key + wall*2, depth, 40]);
    }

    // Tool holes and text labels
    for(i = [0 : len(keys)-1]) {
        x = x_pos(i);
        d = keys[i] + tolerance;
        
        // Key hole
        translate([x, 0, base_h])
            cylinder(d=d, h=50);
            
        // Text label (engraved on the front face)
        translate([x, -depth/2 + 1, 6])
            rotate([90, 0, 0])
            linear_extrude(2)
            text(
                str(keys[i]), 
                size=3.5, 
                halign="center", 
                valign="center", 
                font="sans-serif:style=Bold"
            );
    }
}