Update: April 2022
Someone suggested that I use a screw connector between the guard and grip to give it better holding strength, and boy were they right! So I've replaced three pieces, "grip.stl", "guard.stl", and "connector.stl", with new versions that use a printed screw to hold them together. It's much, much sturdier than the old square connector. If you've downloaded the original model, all you need to download is those three pieces. Everything else is the same.

The original model is a thing of beauty that no self-respecting Klingon should be without. But the handle required supports which then took a while to remove and clean up. And I'm lazy. So I recreated the handle and the hilt to avoid supports. I also replaced the thumb switch for the side blades (since it's just decorative) with the Klingon insignia. All these pieces are scaled down about 10% from the original model, so you cannot mix-and-match.

I also created a sheath with a belt clip so the knife could be worn for cosplay. The knife stays securely in the sheath; it won't fall out even if worn/carried upside down. The sheath has a cutaway down the center so you can zip-tie the knife to the sheath if you are at a Con or other venue which requires all cosplay weapons to be secured. (Plus I think it looks cool!)

Qapla'!