This is an older design of a silent dropper item elevator. It’s not initially by me, but it could be that I modified it. Still, I think it’s one of the best designs, because:
- items can be inserted at any level
- Either has a footprint of 2×9 or can be arranged in an L-shape.
It does have a problem, and that is that sometimes the dropper(s) that get fed with items can get filled up and stuck.
Anyway, here’s the schematic: