The sign will need some supports. I used organic (tree supports) in Prusaslicer.
The author remixed this model.
I added grass and a sign to show what you're saving for to the Snoopy vs Red Baron Bank by lowboydrvr.
Go here for the rest of the design:
https://www.printables.com/model/206432-snoopy-vs-red-baron-bank-compilationremix/remixes