25mm Slotted Base

Added a 20.5mm by 2.5mm slot to Brexitt's 25x25 base for a bunch of cultist models I have that need bases. Test print was great and the slot lines up perfectly with GW slotted bases.

Print with the top side down (on print bed, with zero infil and zero top layers if you want a hollowed base like GW bases. I print with 3 perimeters so the slot's walls touch the walls of the base itself.