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Release v1.0.0 of the ConveyorBelt mod, who give you ... well conveyor belt.
Straightforward and simple: works exactly the way you'd think it would. Crafted at the Assembly Line, connect it between stockpiles and it will transfer all materials from one stockpile to another, with an animation of the item moving beneath the conveyor belt. It can work vertically up/down even if the conveyor belts don't "snap" together visually. Tested in 0.8.3.3