Yet another rack. This can be printed on a Prusa Mk3 Bed dimensions. You will need to PRINT WITH NO TOP AND BOTTOM LAYERS! To make it fit on a MK3, I had to split the bracket in two parts A and B and glue them together.

The pictured infill is 12% honeycomb with 3 perimeter layers (5-6 would have been better). Gyroid infill is another good looking and sturdy option.

For the piece of wood, I used the shelfs of a IKEA Kallax (I used the frame for a beefy filament spool rack ), dimensions 16.2mm thick, 338mm wide (length is variable, in case of Kallax it is 335mm).

There is a version with cutout for cable management.

Fusion360 file is included for customisation. Just enter your board dimensions and bracket thickness in Parameter section and it *should* recalculate.

Happy shelfing!