MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
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I would say it is almost working :-). I´ve checked your design to fix the springs and noticed that there are two slots, so I´ve put now two springs. Bothe are very tight. I´m hoping that the piece will not break, but till now it worked fine. If it will break I will have simply to reenforce the spring holder...
I´m not 100% sure with my Mk8 drive, so I ordered two new onces, hopping that they are maybe a little bit sharper.
I believe I still have an issue with the retraction. I have the impression that the drive is retracting better as inverse.....
I also believe that the retraction length is to long, but I´m not sure where to adjust this.
I have the E3D hotend... And the printer is a self made MegaPrusa. So I have also had to adapt your design a little bit.

Would also be great to get two pictures of the servo in both endpositions. I did the setup as described, but it is always better so see how it should be..
The problem also with the servo is that in some places I could find one enpoint set to 120. And on some others to 110.