This is a customizable maker of bed leveling test objects. Use the Customizer button here to create a test model for your printer and print it.

I print without skirt/brim, and examine the bottoms of the chips to be flat, but not being too squashed (that is, the lines between the filament traces are sill visible).

The numbers on the chips makes it easier to remember on what part of the bed each chip was printed (except for 6 and 9 ;-))