bare-max/claude-opus-4-7 / tier-2-l-bracket

```openscad
// L-bracket with countersunk holes
// Inner corner at origin
// Horizontal flange extends in +Y direction
// Vertical flange extends in +Z direction

// Parameters
width = 50;          // Width (X direction)
depth = 40;          // Horizontal flange depth (Y direction)
height = 40;         // Vertical flange height (Z direction)
thickness = 3;       // Plate thickness

// Hole parameters (M4 countersunk)
hole_dia = 4.5;      // Through hole diameter
csk_dia = 8;         // Countersink diameter
csk_depth = 2;       // Countersink depth
edge_offset = 10;    // Distance from edge to hole center

$fn = 64;

module countersunk_hole_z() {
    // Hole along Z axis, countersink on top (+Z side)
    union() {
        // Through hole
        translate([0, 0, -1])
            cylinder(d = hole_dia, h = thickness + 2);
        // Countersink (cylindrical counterbore for simplicity per spec)
        translate([0, 0, thickness - csk_depth])
            cylinder(d = csk_dia, h = csk_depth + 1);
    }
}

module countersunk_hole_y() {
    // Hole along Y axis, countersink on -Y side (outside of vertical flange)
    union() {
        // Through hole
        translate([0, -1, 0])
            rotate([-90, 0, 0])
                cylinder(d = hole_dia, h = thickness + 2);
        // Countersink on outside (-Y side)
        translate([0, -csk_depth - 0.001, 0])
            rotate([-90, 0, 0])
                cylinder(d = csk_dia, h = csk_depth + 1);
    }
}

difference() {
    union() {
        // Horizontal flange: extends in +Y, thickness in -Z
        translate([-width/2, 0, -thickness])
            cube([width, depth, thickness]);
        
        // Vertical flange: extends in +Z, thickness in -Y
        translate([-width/2, -thickness, 0])
            cube([width, thickness, height]);
    }
    
    // Holes in horizontal flange (along Z axis)
    // Center line is X = 0, holes offset symmetrically along X
    // Hole position in Y: edge_offset from far edge, and edge_offset from near edge (corner)
    // Two holes on horizontal flange centerline (Y direction)
    translate([0, edge_offset, 0])
        countersunk_hole_z();
    translate([0, depth - edge_offset, 0])
        countersunk_hole_z();
    
    // Holes in vertical flange (along Y axis)
    // Two holes on vertical flange centerline (Z direction)
    translate([0, 0, edge_offset])
        countersunk_hole_y();
    translate([0, 0, height - edge_offset])
        countersunk_hole_y();
}
```