Cornhole board bubble level. Similar to one that can be purchased elsewhere online. Place it on the back of the board to check for proper board orientation in all directions. Works for regulation 2x4 foot cornhole board.

Can be turned 180 degrees to check the front of the board as well.

Sized to fit a standard circular RV bubble level, 32x7mm that can be found for cheap on Amazon. This will not be a press fit. You will need hot glue or something similar to hold the bubble in place.

Note: .stl and .stp file units are inches.