This is a remix of Joseph Larson's (cymon's) stackable chess set.
Check out the original here: https://www.thingiverse.com/thing:19825

I added the piece's symbols on the sides so that they are easier to tell apart when stacked on top of each other.

NOTE: The pawns in the images still have their symbol placed horizontally but the STLs will have them be vertical. I just didn't want to reprint all of them when i noticed the mistake.