Cups that the aluminum standoff posts can snap into to add height to various areas that are way off flatness. The standoffs press fit into these cups that add quite a bit of height for beds that are really warped.
Print settings not important, whatever works well for your printer, but I would suggest PETG or better for temp as the heated bed could warm the standoffs and soften the cups.s
The author marked this model as their own original creation.