/* [Plate and Holes] */
plate_thickness = 4; // [1:0.1:10]
hole_diameter = 6; // [2:0.1:12]

/* [Appearance] */
bracket_color = "SteelBlue"; //

/* [Hidden] */
$fn = 96;

// Millimeters. Outer corner is [0,0,0].
// Fixed outer envelope: X=60, Y=40, Z=40.
// Hole centers are fixed to outer datum faces, independent of thickness.
// Installed orientation: base on XY plane.
// For side printing, rotate 90 degrees about X so the XZ profile lies on the bed.

module bracket_plates() {
    union() {
        cube([60, 40, plate_thickness]);
        cube([plate_thickness, 40, 40]);
    }
}

module mounting_holes() {
    for (hole_center_y = [10, 30]) {
        // Base holes: axes parallel to Z, X=40.
        translate([40, hole_center_y, -1])
            cylinder(h=plate_thickness + 2, d=hole_diameter);
        // Upright holes: axes parallel to X, Z=25.
        translate([-1, hole_center_y, 25])
            rotate([0, 90, 0])
                cylinder(h=plate_thickness + 2, d=hole_diameter);
    }
}

module l_bracket() {
    difference() {
        bracket_plates();
        mounting_holes();
    }
}

color(bracket_color) l_bracket();