Printing machine for commercial or industrial use, for printing on the ground, for printing on walkways, for printing on stair treads and stair risers, for printing on step edges, for ground marking, for printing on turf, artificial grass, gravel, concrete, playgrounds, pavements and roads; robotic printing machine, namely, robots for printing for commercial or industrial use; autonomous robotic printing machine, namely, robots for printing for commercial or industrial use; ground printing su...