$fn=64;

// --- Parameters ---
holder_width = 120;       // Overall width of the block
holder_depth = 100;       // Overall depth of the block
height_front = 25;        // Height at the front edge
height_back = 60;         // Height at the back edge
base_thickness = 10;      // Solid material thickness below the slots
slot_angle = 15;          // Lean-back angle of the rulers (degrees)
slot_spacing = 15;        // Distance between each slot
start_y = 15;             // Y position of the first slot

// Array of slot widths (from front to back)
// Accommodates thin steel rulers up to thick aluminum/wood straight edges
slots = [1.0, 1.5, 2.0, 2.5, 3.0, 4.0];

// --- Geometry ---
difference() {
    // Main body: Sloped wedge design
    hull() {
        // Base footprint
        cube([holder_width, holder_depth, 0.01]);
        // Front vertical face
        cube([holder_width, 0.01, height_front]);
        // Back vertical face
        translate([0, holder_depth - 0.01, 0]) 
            cube([holder_width, 0.01, height_back]);
    }

    // Cutout slots for rulers
    for (i = [0 : len(slots) - 1]) {
        y_pos = start_y + (i * slot_spacing);
        
        translate([-1, y_pos, base_thickness])
            rotate([-slot_angle, 0, 0])
            // Cutter dimensions extended to ensure clean manifold cuts
            cube([
                holder_width + 2, 
                slots[i], 
                height_back + 20
            ]);
    }
}