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Looks to be a bullet hinge.
One area I would be concerned with is the exposed stepper lead screw; exposed to dirt, mud and chemicals may adversely affect the operation of the suspension. Just a thought ...
Very nice! I was just looking at a CNC plotter project and thinking if it could be made vertical, it would reduce the floor space, now your project does just that. The issue I saw with that project was the pen mechanics which used a servo to lift the pen off the paper; you have solved that issue. I notice that if you put the pen at the bottom of your carriage, it would always be pointed slightly down, not up and would not dry out so fast.
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