I was in need of a simple yet elegant shelf but with the support of the Multiboard Multigrid baseplate. Sadly, there were only small shelves as well as Multigrid baseplates. The shelves weren't the same size (small only) where as the baseplates only were themselves. Thus I spliced the two together.

Note: the slicer WILL complain about overhangs and/or missing maniforld edges. This 4x3 size usually doesn't show warnings. Though, it prints perfectly fine either way if you're printer and filament are well enough calibrated for bridges and overhands.

PLA and PTEG seem to print this fine. Though the Carbon Fiber (-CF) filaments seem to have problems with the edge overhangs so I recommend avoiding those.