bare/gemma-3-27b / tier-2-l-bracket

```openscad
// L-bracket parameters
width = 50;
depth = 40;
height = 40;
thickness = 3;
screw_diameter = 4.5;
countersink_diameter = 8;
countersink_depth = 2;
hole_offset = 10;

// Module for creating a countersunk hole
module countersunk_hole(diameter, depth) {
  difference() {
    cylinder(h=thickness + depth, r=diameter/2);
    translate([0, 0, -depth]) cylinder(h=depth, r=(countersink_diameter)/2);
  }
}

// Horizontal flange
module horizontal_flange() {
  difference() {
    cube([width, depth, thickness]);
    // Countersunk holes on the top face
    translate([hole_offset, depth/2, 0]) rotate([90,0,0]) countersunk_hole(screw_diameter, countersink_depth);
    translate([width - hole_offset, depth/2, 0]) rotate([90,0,0]) countersunk_hole(screw_diameter, countersink_depth);
  }
}

// Vertical flange
module vertical_flange() {
  difference() {
    cube([width, thickness, height]);
    // Countersunk holes on the front face
    translate([width/2, 0, hole_offset]) rotate([0,90,0]) countersunk_hole(screw_diameter, countersink_depth);
    translate([width/2, 0, height - hole_offset]) rotate([0,90,0]) countersunk_hole(screw_diameter, countersink_depth);
  }
}

// Combine the flanges to create the L-bracket
union() {
  horizontal_flange();
  translate([0, depth, 0]) vertical_flange();
}
```