Crosshairs Board Game Enhanced Altitude Piece

This remix of JGplanes's altitude pieces

• makes the pieces snap together
• adds a small channel along the perimeter to use a pen or paintbrush on (this makes it easier to see how much altitude a given plane has)
• and adds a bottom to allow for more surface area to keep the print stable.

Original work:
https://www.thingiverse.com/thing:3307644/files

Original board game:
https://boardgamegeek.com/boardgame/78093/crosshairs