When printing this armour set orientation, splitting, and slicing is up to you. I recommend splitting object with Z-offset in slicer of choice to minimize the need for support structures and maintain cleanliness of the model. If you have a small build area and need to print in chunks I recommend Meshmixer. All files are in .obj format. Most slicers accept this but in case yours cant there are free online tools to convert to .stl. Also keep in mind that you as an individual may have to resize respective to your body type. The way I like to print these is to print the solid version with at least 12 shell walls and no infill. This makes the part very strong but also prints the fastest. I use a wood-burning tool to cut out a hole for the bottom and visor and then clean up with sanding tools.