My wife bought and painted some X's and O's with our boys and I wanted to make a nice Tic Tac Toe board to go with the X's and O's. Of course, it had to be big enough to house the X's and O's, but also be able to be printed by my Ender 3, so I designed it Lincoln-Log-style so the parts easily interlock. They're a little loose on purpose as the # doesn't need to be a tank; it needs to be easy to put together and take apart.

Although I didn't need them, I also designed X's and O's that go with the board. The letters are a bit taller than the board to make them easier to grab.