These two models are designed for Prusa MK3S and Prusa MK3S+ first layer calibration. You can use the 30mm square or 25mm square design as you wish.
There are gcodes ready to be used if you have one of both 3D printers.
WARNING: This design has been created for PLA and 0.2mm of layer height.
The author marked this model as their own original creation.