This is a monitor stand which uses a 235mm wide x 19mm thick timber board from Bunnings.

Here is the exact one I used: 235 x 19mm 1.2m DAR Pine Premium - Bunnings Australia

You can cut the board to any length you prefer. In my case I used 66cm, which appears to be super sturdy.

No need to tweak slicer settings, the honeycomb pattern is baked into the model.

Print Settings

Layer Height: 0.20 - 0.32mm

Nozzle size: 0.40mm

Infill: 15%

Material: PLA (I recommend using a strong PLA filament, in my case Polymaker Polywood was sufficient).

Print orientation: Recommended to print with the honeycomb side on the printed.