I have split the stl's into seperate items incase you prefere to print off individually, or you can print off the assmbly.stl in one go.
Print with a few extra perimeters for strength and infill of your choice YMMV.
To use, open the jaws a little and pop a nut down into the cone, orientated the nut if necessary and then squeeze the handle to crack.
To take apart for cleaning, just pull the hinge piece out from the top.
I'm still printing mine off, let me know your results.