This is a remix of MysticTome's excellent Betrayal at House on the Hill 3rd Edition box organizer – specifically the parts that don't fit on the bed of a Prusa i3 mk3 (S/S+).
The files include:
Betrayal_3rd_Player_Board_Prusa_i3: the “Betrayal_3rd_Player_Board” file with the corners cut off so that it barely fits diagonally on the Prusa i3 mk3 bed.
Betrayal_3rd_Tile_Stack_Side and Betrayal_3rd_Tile_Stack_Middle: these are the parts to make the middle section that holds the map tiles ("Three_Stack_Betrayal_Holder.3mf" in the original). These are re-sculpted to allow it to be printed as three separate parts. (Print two copies of _Side. Together the three fit nicely in the box like the original part that is three slots in one.