Being as a training knife was needed for a class, I figured I would try and make one. I modeled it after my folding knife. I thickened and dulled the blade so it can't cause injury. (Just don't horseplay with it). I've attached both versions of the file. One that is full and the other being two parts; blade and hilt. I used 30% infill for the blade and 20% for the hilt since I had to print in two stages. Blade didn't seem to have enough support on lower percent. I printed the blade standing up. Needed to add support to it as it's at a slight angle. When completed, it's 9.5 inches long.

I used 123D Design to model it. Please enjoy!