It prints in one piece with the runner, hinge and stop already inside it. Take it off the bed and it opens.
Get the file when it's out

Keep pulling and it drops onto its stop at 25°. The runner stays level and the stop holds it there.
Every moving part was proven on a small test print before it went into a drawer. This is the list, in order, with what each one told us.

Every drawer is one unit deep and grows wider or taller in whole units. We sized ours by counting every screw, nut and washer we own, 3,932 of them, and giving each thread size its own.