Two bracket types. One elegant frame designed to save filament and print time. And another, solid bracket for strength and durability. The design comes with countersunk screw holes and removable covers to hide the screws.
Although the elegant bracket was designed to save filament, it turns out not to save much filament, in production--only about a meter. And that's with 20% infill, and turning down the infill sq. cm. threshold. Not really worth it if you have layer adhesion issues.
But I liked how it looked so much that I left it in. So there.