How to Get Supplies Into Machines in Satisfactory

Every machine in the game has the same requirement: the right items arriving at the right port fast enough. The ways to achieve that are few, and knowing which one suits a situation saves a lot of rebuilding.

The four ways to feed a machine

By hand. Open the machine and drop items in. Fine for a one-off craft, useless for anything continuous. Worth knowing that a hand-loaded machine will run until its input buffer empties and then stop silently.

Direct from an extractor. A miner belted straight into a smelter is the simplest automated arrangement in the game and often the right one. No splitters, no distribution, nothing to go wrong.

From storage. A Storage Container with an output belt turns accumulated stock into supply. Useful for buffering an irregular producer, and for feeding something you only run occasionally.

From a manifold. One belt running past a row of machines with a splitter tapping off at each. This is how most factories feed most machines, and it is almost always the right answer for a row.

Machines have separate ports for separate things

This trips people early. A Refinery has both a fluid input and a solid input, and they are physically different connection points. Belting a solid to the fluid port does nothing, and the belt will simply refuse to connect.

The rule: solids on belts, fluids on pipes, and each goes to its own port. If a connection will not snap, you are usually aiming at the wrong port rather than doing something illegal.

Output ports work the same way. A recipe producing a solid and a fluid needs both routed away, and leaving either unconnected will eventually stall the machine entirely.

Why a machine looks idle

Four causes, distinguishable by what the machine tells you.

Nothing arriving. The input buffer is empty and the machine sits still. Trace the belt backwards; usually the problem is further upstream than you expect.

Arriving too slowly. The machine runs briefly, stops, runs again. This is the most misdiagnosed state because the machine visibly works. It means input rate is below what the recipe consumes.

Output blocked. The machine has finished a cycle and cannot place the result. Check downstream, and check byproducts specifically — a blocked byproduct line stops the main product too.

No power. Obvious when the whole grid is down, less obvious when one section is disconnected.

Manifolds take time to fill

A manifold feeds machines front to back. The first machine in the row fills its input buffer, then the second, and so on. On a long row the last machine can take several minutes to reach full rate after you build it.

This is normal and it resolves itself, provided total supply exceeds total demand. If it does not, the far end stays starved permanently, and no amount of waiting fixes it.

So the diagnostic question when the end of a row is idle is: has it been long enough, or is the row genuinely undersupplied? Compare the belt’s rate against the row’s total consumption. If the belt carries 300/min and eight machines each want 60/min, the row needs 480/min and four machines will always be short.

Sizing a row properly

Work from the recipe, not from intuition.

1. Find the input rate per machine for the recipe you are running.
2. Multiply by the number of machines in the row.
3. Check that against your belt mark. Mk.3 carries 270/min, Mk.5 carries 780/min.
4. If the row exceeds the belt, either split the row across two belts or use a faster belt.

This is a two-minute calculation that prevents the most common factory disappointment, which is building twelve machines and discovering the belt only supports seven.

Feeding from storage: when it helps

A Storage Container between producer and consumer does three useful things:

Buffers an irregular supply. A miner sharing output with another line delivers unevenly; a container smooths it.

Lets you stockpile before you need it. Running a production line into storage overnight means the next project starts with materials ready.

Prevents upstream stalls. A container with spare capacity absorbs surplus rather than letting a full downstream line back up the whole chain.

The caution: a container is not infinite. If the consumer permanently outpaces the producer, the container merely delays the problem by however long it takes to empty.

Mixed belts and Smart Splitters

Sometimes a single belt carries several item types — usually coming out of a storage container or a shared line. A Smart Splitter filters one item type to one output and passes the rest through.

The setting worth knowing is Overflow: an output set to Overflow only receives items when the other outputs are blocked. That turns a splitter into an automatic relief valve, which is the cleanest way to prevent a full line from stalling everything behind it.

Underclocking as a supply tool

If a row is slightly undersupplied, the instinct is to add belt capacity. Often the better move is to reduce demand instead.

Underclocking a machine below 100% reduces both its output and its input requirement, and power scales by an exponent, so the power saving is disproportionately large. Eight machines at 80% consume the same total input as roughly six and a half at 100%, while drawing noticeably less power than either arrangement at full clock.

This is useful when you are matching a row to a fixed supply, such as a single node’s output. Rather than building however many machines the belt supports and leaving the last one starved, build the number you want and underclock all of them to fit. Every machine then runs steadily, which is easier to reason about than a row where the tail end sputters.

Feeding fluids is a different problem

Everything above concerns solids on belts. Fluids behave differently in one way that matters: pipe flow fluctuates by design, so a fluid-fed machine will show small variations even when correctly supplied.

The fix is a Fluid Buffer between the source and the consumer, which absorbs the fluctuation and delivers steadily. If a fluid-consuming machine is cycling irregularly and the supply rate on paper is adequate, add a buffer before investigating anything else.

Common mistakes

Aiming a belt at the wrong port. Fluids and solids have separate inputs.

Assuming a slow-cycling machine is broken. It is undersupplied. Check the rate, not the machine.

Waiting for a manifold that is undersupplied. Filling only completes if supply exceeds demand.

Building the row before checking the belt. Count the total input rate first.

Leaving a byproduct output unconnected. It stalls the main product too.