Improved open hinge for QIDI printer

I really like the open hinge concept and I took it a couple steps further.
Here are two added features:

1 - Keeps the door open; when the door if fully open, slide to the right to lock the door into the open position
2 - Hinge only separates @ 30 degrees from vertical. The hinge will not let go of the door unless the door is almost all the way open. This means through most of the motion of opening, the door will stay where it is. Also the door will not come off while in the fully opened and