I made this part as a replacement for an old kitchen knife whose handle broke, and I took the opportunity to improve it a little by enlarging it and enhancing its grip.
It's green because it's the only filament I have right now, don't judge me.
The holes are not aligned because they are like that on the blade.
I realize as it is it wouldn't be of much use to anyone else, so I'm adding the source file (SketchUp) which you can modify to adapt to your blades.
As it is, it uses 2 M5 flat-head screws to keep the blade in place.