Weighted Ejector

Like the Mechanical Arm, the ejector is set up before it is placed. Holding it, right-click the block that should receive the items: it is remembered. Then place the ejector where you want it and it turns towards its target on its own. With no target picked, it simply throws onto the block right in front of it.

The target must lie straight in line with the ejector, on one of the four horizontal axes, never directly above or below. It can be higher or lower, up to 32 blocks each way. A target shifted sideways, even by a single block, is refused: move the ejector, not the target.

The ejector needs rotation: 2 SU per RPM. Put an item on it and the plate flips up at once; the item follows a trajectory computed to land right on the target. The plate then winds back down slowly, faster when the rotation is fast and the target close: it takes 1.6 s at 32 RPM for a target 4 blocks away.

On arrival, the item goes straight into whatever can take it: Depot, Mechanical Belt, another ejector, Funnel, Chute… On an ordinary block it drops to the ground at the aimed spot. If it hits an obstacle on the way, it stops there and falls: keep the path clear.

The value panel sets a stack size: the ejector waits until it holds that many items before launching. Set to 10, it lets a belt deliver blocks one at a time, waits, then sends all 10 at once. On "*", it throws everything it gets straight away.

Placed against the side of a Brass Tunnel, the ejector becomes one of its outputs. The tunnel offers it a stack of 64 ingots: set to 10, the ejector only accepts 10 and the rest carries on along the belt. It then throws them towards another line. It is the simplest way to divert an exact amount.

A redstone signal blocks the ejector: it keeps its item on the plate while the lever is on, and fires as soon as it is turned off. The other way round, an observer placed against the ejector sends a pulse at every launch, enough to count shipments or trigger the next machine.