Dungeon tile
This is a tile I created that can lock with other printed tiles. 1x1 Inch or 25.4mm x 25.4mm
I made this for my DnD map. I also liked devonjones tiles, and I use those as well.
http://www.thingiverse.com/devonjones/designs
The walls he made are fantastic and I will create my own modified version of walls.