This mask is a no-assembly model. So you don't have to any slicing process, just print it as it is. However, if you want it to be sliced I can do it for you. You can scale this mask in your 3D printer software upon your needs. There are also .obj and .fbx files in case you don't want to use it for 3d printing.
If you got any questions don't hesitate to ask me. Thank you and happy printing!