Anet a6 Z Stop

Adjustable Z stop for Anet a6 3d printer. I have just printed and mounted the stop have not used it yet, still building the printer. Designed the stop using DesignSpark Mechanical 2.0, I have included the files to make it easier to remix.
The part that is mounted on the X axis you need to slide an M3 nut in the slot, and I used an M3*30 screw, placed a washer on top of a small spring. The spring is to keep friction on the screw to prevent if from turning.