Print bottom not flat

[Agan]

sorry, my mistake/fault - it's M8010:
;¡¾step related parameters¡¿After the parameters are set, please print a cube, then use the ruler to measure the size to confirm that there is no problem with the parameters.
M8010 S0.000625 ; ¡¾Z mm value per step¡¿ Calculation formula: lead / ((360 / 1.8) * 16).

I see the field now, but I still don't fully understand the modifications to make. What do you call the lead here?i'm kind of new to the mars, znd 3d printing in general