I am working on this, though it will be a while before I have time to print all the parts. One problem I find is with the spring. Using Cura, it slices so that one of the screw holes is not fully surrounded by material, like this: https://photos.app.goo.gl/6fgGqbAo87DxpZMy2. This is true with various shell settings. I am using an ugly hack where I edited the STL in blender to add a little more material, but I wonder if you have a better solution.