A model of the Apex Legends throwing knife, made by me in Blender. 

There are low poly(unbeveled) versions of the model, which are my recommended method for editing the model, I.E. for a remix. 

There are also beveled versions, meant to be smoother for a high quality, nice looking print. I would take care to not mix the files up if downloaded. 

There are halved models, which are unclosed meshes, meant to be edited then mirrored.

There are the halved printable models, which are closed versions if you wanted to print in 2 halves then glue them together.

Finally, the unspecified models are the final .stl, meant to be printed as one piece.

I would recommend printing in the same orientation as the below Cura screenshot. You have to get the model roughly aligned, then use the Lay Flat button under the rotate menu. Support as you please.