Prusa also said he would like to eventually open the slicer app to all printer brands. Since many popular slicers are derived from PrusaSlicer, it wouldn’t be that hard.

See, a slicer is a piece of software for your PC or Mac that can convert a 3D model file -- normally with the file extension .STL, .3MF or .OBJ -- into a file that is usable by your 3D printer.