$fn = 64;

/* 
 * Stepped Slot Wrench Rail (Metric 8-19mm)
 * Holds 12 wrenches, stepped height, angled slots.
 */

// --- Parameters ---
num_wrenches = 12;      // 8mm to 19mm
start_size = 8;         // Starting metric size
spacing = 22;           // Distance between slots
base_width = 40;        // Width of the rail
min_height = 20;        // Height at the smallest wrench
max_height = 50;        // Height at the largest wrench
min_slot_width = 4.0;   // Slot width for 8mm
max_slot_width = 8.5;   // Slot width for 19mm
slot_depth = 18;        // Depth of the slots
slot_angle = 25;        // Degrees to tilt the wrench back
margin = 15;            // Flange length for mounting
flange_height = 8;      // Height of mounting flanges

difference() {
    // Main Body
    union() {
        // Left Mounting Flange
        translate([-margin, 0, 0]) 
            cube([margin + 0.1, base_width, flange_height]);
        
        // Stepped Rail Sections
        for(i = [0 : num_wrenches - 1]) {
            h = min_height + (max_height - min_height) * (i / (num_wrenches - 1));
            translate([i * spacing, 0, 0])
                cube([spacing + 0.1, base_width, h]);
        }
        
        // Right Mounting Flange
        translate([num_wrenches * spacing - 0.1, 0, 0]) 
            cube([margin + 0.1, base_width, flange_height]);
    }
    
    // Subtractions
    for(i = [0 : num_wrenches - 1]) {
        h = min_height + (max_height - min_height) * (i / (num_wrenches - 1));
        w = min_slot_width + (max_slot_width - min_slot_width) * (i / (num_wrenches - 1));
        
        // Main Wrench Slot
        translate([i * spacing + spacing/2, base_width/2, h])
            rotate([-slot_angle, 0, 0])
            translate([-w/2, -base_width, -slot_depth])
            cube([w, base_width * 2, slot_depth + 30]);
            
        // Slot Lead-in (Slightly wider at the top for easy insertion)
        translate([i * spacing + spacing/2, base_width/2, h])
            rotate([-slot_angle, 0, 0])
            translate([-(w + 1.5)/2, -base_width, -2])
            cube([w + 1.5, base_width * 2, 30]);
            
        // Metric Size Labels (Front face)
        translate([i * spacing + spacing/2, 1, h - 13])
            rotate([90, 0, 0])
            linear_extrude(2)
            text(str(start_size + i), size=6, halign="center", valign="center", font="Arial:style=Bold");
    }
    
    // Left Mounting Hole (Counterbored)
    translate([-margin/2, base_width/2, -1]) {
        cylinder(h = flange_height + 2, d = 4.5);
        translate([0, 0, 5]) 
            cylinder(h = flange_height, d = 9);
    }
    
    // Right Mounting Hole (Counterbored)
    translate([num_wrenches * spacing + margin/2, base_width/2, -1]) {
        cylinder(h = flange_height + 2, d = 4.5);
        translate([0, 0, 5]) 
            cylinder(h = flange_height, d = 9);
    }
}