Designs for smaller-sized angle brackets with additional stabilizers on the side for improved strength.

Both are designed for screws of 4.5mm to 5mm in diameter and have a cutout to "hide" the screw's head. One version additionally has a 'slot' design that grants additional fine-tuned adjustments to positioning of the bracket when necessary.

The smaller version is 3 x 3 x 3cm, the larger 3.5 x 3.5 x 3 cm (D x H x W), where the longer sides are the ones with the screw hole cutouts.

I would recommend printing with at least 30% infill and PETG. Preferably, print on either of the two larger flat sides. Alternatively, use some support and print it face down on the smaller stabilizers

I personally use adapter version of these for a more specific usecase with PETG, 50% infill and they work just fine so far.