An extra thin version of the minimal base plate*. Uses about half the filament as the standard 4x4 baseplate. Smooth underside.

If you want other sizes (eg 5x3, 2x4) use the .f3d file in Fusion 360 to change the rectangular pattern. Or maybe message and ask me nicely :)

*Minimal base plate = What you get when bare gridfinity frames meet magnet baseplate.