A shelf! It mounts to the wall using a french cleat.
I tested its load capacity with an 8 pound dumbbell and it didn't budge. It's very sturdy but I'd still recommend displaying lighter items on it. For reference, the heaviest ceramic vase I have is 1lb 10oz, so most items that will fit on this shelf should be fine.
Supports None needed! You could use supports on the back of the shelf on the bottom of the french cleat opening, but they're not necessary. That area will bridge just fine. It might not be the cleanest bridge, but it's the back and won't be seen once the shelf is mounted.
Scaling I wouldn't recommend scaling this one since the screw holes are designed specifically for #10-12 x 1-1/4 in screws.
Orientation The shelf prints upside down and the cleat should be printed with the wider side facing down.
Print Settings .2mm layer height 10% grid infill 4 walls Monotonic top and bottom surface pattern
Other Info I've also included the mirror image of this shelf. Would be great to use both versions on a display wall.
Filament & Hardware Filament I used for this print: Overture PLA Matte Light Brown Hardware: #10-12 x 1-1/4 in screws
Filament and hardware/non 3D printed items for this model can be found on my Amazon Storefront, linked here: https://hendricks.design/links/
I've also included the 3MF file for this one. Let me know if that's helpful!