$fn=64;

// --- Parameters ---
leg_length = 60;        // Total length of each leg
leg_width = 25;         // Width of the base channel
wall_height = 12;       // Height of the outer retaining wall
wall_thickness = 3;     // Thickness of the retaining wall
base_thickness = 3;     // Thickness of the base plate
hole_diameter = 6;      // Diameter of connection holes
hole_offset = 12;       // Distance from ends for the connection holes

module deskgrid_corner() {
    difference() {
        union() {
            // Base X-axis
            cube([leg_length, leg_width, base_thickness]);
            // Base Y-axis
            cube([leg_width, leg_length, base_thickness]);

            // Outer Wall X-axis
            cube([leg_length, wall_thickness, wall_height]);
            // Outer Wall Y-axis
            cube([wall_thickness, leg_length, wall_height]);

            // Inner corner reinforcement (fillet)
            translate([leg_width, leg_width, 0])
                cylinder(h=base_thickness, r=4);
            translate([leg_width-4, leg_width, 0])
                cube([4, 4, base_thickness]);
            translate([leg_width, leg_width-4, 0])
                cube([4, 4, base_thickness]);
        }

        // Connection Hole X-leg (centered in the channel)
        translate([leg_length - hole_offset, (leg_width + wall_thickness)/2, -1])
            cylinder(h=base_thickness + 2, d=hole_diameter);

        // Connection Hole Y-leg (centered in the channel)
        translate([(leg_width + wall_thickness)/2, leg_length - hole_offset, -1])
            cylinder(h=base_thickness + 2, d=hole_diameter);

        // Connection Hole Corner
        translate([(leg_width + wall_thickness)/2, (leg_width + wall_thickness)/2, -1])
            cylinder(h=base_thickness + 2, d=hole_diameter);

        // Chamfer main outer corner
        translate([0, 0, 0])
            rotate([0, 0, 45])
            cube([6, 6, wall_height * 3], center=true);

        // Chamfer X-leg ends
        translate([leg_length, 0, 0])
            rotate([0, 0, 45])
            cube([10, 10, wall_height * 3], center=true);
        translate([leg_length, leg_width, 0])
            rotate([0, 0, 45])
            cube([10, 10, wall_height * 3], center=true);

        // Chamfer Y-leg ends
        translate([0, leg_length, 0])
            rotate([0, 0, 45])
            cube([10, 10, wall_height * 3], center=true);
        translate([leg_width, leg_length, 0])
            rotate([0, 0, 45])
            cube([10, 10, wall_height * 3], center=true);
    }
}

// Render the part
deskgrid_corner();