$fn = 64;

// --- Parameters ---
arm_length = 120;      // Total length of each arm from the outer corner
arm_width = 30;        // Width of the clamping arms
thickness = 20;        // Thickness of the square
hole_diameter = 10;    // Diameter of holes for clamps or bench dogs
hole_spacing = 20;     // Spacing between the clamping holes
relief_radius = 4;     // Inner corner relief radius for sawdust clearance
corner_radius = 3;     // Rounding radius for the outer edges

module woodworking_corner_clamp() {
    difference() {
        // Main body: Extruded L-shape with rounded outer corners
        linear_extrude(height = thickness) {
            difference() {
                // Use offset to round outer corners while keeping the inner corner sharp
                offset(r = corner_radius) {
                    offset(r = -corner_radius) {
                        union() {
                            square([arm_length, arm_width]);
                            square([arm_width, arm_length]);
                        }
                    }
                }
                
                // Sawdust relief cut at the exact inner corner
                // Ensures perfectly flush seating even if wood edges have tear-out or debris
                translate([arm_width, arm_width]) 
                    circle(r = relief_radius);
            }
        }

        // Clamping holes along the X-axis arm
        for (x = [arm_width + 20 : hole_spacing : arm_length - 10]) {
            translate([x, arm_width / 2, -1])
                cylinder(h = thickness + 2, d = hole_diameter);
        }

        // Clamping holes along the Y-axis arm
        for (y = [arm_width + 20 : hole_spacing : arm_length - 10]) {
            translate([arm_width / 2, y, -1])
                cylinder(h = thickness + 2, d = hole_diameter);
        }
        
        // Central clamping hole at the corner intersection
        translate([arm_width / 2, arm_width / 2, -1])
            cylinder(h = thickness + 2, d = hole_diameter);
            
        // Optional: Chamfer the bottom edges of the holes slightly for easier bolt insertion
        // (Achieved simply by using a slightly larger cylinder at the very bottom/top if needed, 
        // but kept to straight cylinders here for maximum printability and simplicity).
    }
}

// Render the part
woodworking_corner_clamp();