FACTORY OPTIMIZATION: BELTS & PRODUCTION DEEP-DIVE | ENDFIELD BLOG

The moment Endfield’s factory systems clicked, it felt less like playing a game and more like unlocking an engineering degree. After tearing down production lines multiple times and finally achieving a perfectly balanced heavy xiranite chain, here are the lessons learned the hard way.

If your factory is limping along, your AIC report shows a fraction of theoretical output, and cuprium solution drips out like a broken faucet, this guide is for you.

TL;DR - Key Points

• Depots buffer, don’t route — Connect producers directly to consumers; depots only for surplus or stockpiling
• One reactor = 30 units/min — Fixed production time; adding input belts doesn’t speed it up, parallelize instead
• Heavy xiranite needs 3 belts — Scaling means tripling xiranite production, not just expanding
• Overflow valves on byproducts — Sewage output deadlocks crucibles; split flow to purifiers as emergency release
• AIC report is diagnostic — If current output is under 80% theoretical, walk the line to find stalled segments
• Test single line first — Balance one complete chain, then blueprint and tile for scaling

The Golden Rule: Depots Are Not for Throughput

Depots serve one purpose: buffering surplus. They are not meant for passing materials between machines. Routing everything through storage parks creates massive latency and hides bottlenecks.

If you’re making xiranite solely to turn it into heavy xiranite, connect crucibles or forges directly to the next stage. Depots should only sit on lines where you have:

• Multiple consumers pulling at different rates, or
• A desire to stockpile for future use or manual pickup

Deleting the central xiranite warehouse and letting belts flow straight smooths throughput instantly.

Understanding the Heartbeat: Recipe Rates

Every recipe in Endfield has a fixed production time. The basic reactor cycle produces one output per two seconds, meaning a single reactor produces 30 units per minute regardless of how many input belts you attach.

The Cuprium Solution Nightmare

Feeding 50 acid and 50 cuprium powder into one reactor yields only 30 solution units per minute. The issue is twofold:

1. One reactor = one recipe instance. Even with two powder belts attached, the reactor only consumes one belt’s worth. Extra material sits, clogs, and backstops the entire chain. Four powder belts require four separate reactors.
2. Acid recirculation clog. Piping precipitation acid from purification straight back into the reactor’s acid input fills the buffer instantly and prevents fresh acid from flowing.

The fix: Dump precipitation acid into your acid pool or a dedicated dump spot. Never loop it directly into an active input. Build one reactor per powder line.

Scaling Up: Heavy Xiranite and the Three-Belt Truth

Heavy xiranite production consumes three full belts of xiranite. If running a single xiranite line before, you’re not just expanding — you’re tripling.

The forge limit increases in updated outposts, giving room to build, but you need to rethink your layout entirely. Dedicate an entire factory wing to xiranite refining, with parallel crucible arrays feeding into a manifold that splits to heavy xiranite reactors.

Key principle: match consumption to production in a 1:1 flow without intermediate storage.

If your xiranite belt is full and the heavy xiranite machine isn’t running constantly, check whether xiranite effluent (the byproduct) is backing up.

The Offline Sewage Bug and Expanded Crucible Jank

Expanded crucibles are efficient but produce sewage as part of their internal recycling step. If the sewage output line fills to capacity — which happens frequently due to the offline belt-speed slowdown bug — the crucible can’t expel the byproduct and shuts down entirely.

Crucibles run fine while online, but logging off causes two of four to seize up. The problem is always the same: the sewage output has nowhere to overflow.

The solution: Take the sewage output of two cuprium refiners, merge them, then use a pipe splitter to divide the flow in half. Send one half to your two expanded crucibles, and the other half to a pair of water purifiers. The purifiers act as an emergency pressure release. If crucibles can’t consume the sewage, it pushes through to the purifiers and the line never deadlocks.

This change eliminates offline clogging permanently.

Decoding the AIC Report: Theoretical vs. Current

A theoretical output of 2,000 xiranite per minute against a current output of 300 almost always means one of two things:

• Full storage: If ore depots are capped, mining rigs throttle down and stop producing. The theoretical number assumes unlimited storage. Increase consumption or expand your depot.
• Bottleneck downstream: A reactor, refiner, or belt is jammed. Trace back from the final product. Is a pipe segment empty when it should be full? Are all reactors flashing “working”? A single buried splitter set to the wrong ratio can throttle an entire factory.

Treat the theoretical value as a diagnostic tool, not a target. If current is less than 80% of theoretical, walk the line until you find a segment that’s not moving.

Belt saturation diagnostics:

Building a Scalable Factory Layout

The philosophy for any new production chain:

1. Direct connections only. Solid belts from producer to consumer. No depots mid-chain.
2. One reactor per input line. Never combine multiple input belts of the same material into a single reactor. Parallelize.
3. Overflow valves on all byproducts. Sewage, effluent, inert gas — always give them a secondary path to a purifier or dump pool.
4. Monitor conveyor saturation. Check belt segments regularly for bottlenecks.
5. Test with a single line first. Build one complete reactor-to-product chain, balance the flows, then blueprint and tile.

Reference Setup: Cuprium to Hetonite

For one full belt of hetonite solution:

• 4 cuprium powder lines (each its own refiner)
• 4 cuprium solution reactors (one per powder line)
• 1 purification unit per 4 reactors (slightly underused, which is fine)
• Acid supplied by a half-pump per two reactors
• Sewage merged and split with the overflow trick
• Precipitation acid sent directly to a dump pool, not looped

This layout runs at 100% uptime and survives multiple offline cycles without a single jam.

Preparing for Future Updates and New Biomes

Wuling’s Northern Exclusion Zone (unlocking in a later patch) brings new cuprium and originium ore nodes along with a sewage treatment plant that outputs xircon effluent. This means integrating a new waste stream into existing lines without breaking balance.

The plan: dedicate one factory entirely to closed-loop recycling when the update drops, using the new sewage plant as an input rather than a dump. The same principles apply: direct flow, parallelized reactors, overflow valves.

Final Tips for Your Own Factory Journey

• Don’t be afraid to tear it all down. Each iteration should be cleaner, more efficient, and easier to troubleshoot. Blueprint working segments for fast reconstruction.
• Use community guides as a starting point if overwhelmed. Day 1 layouts provide an excellent foundation that respects all the principles outlined here. Modify as you unlock more tech.
• Play the main story aggressively. A surprising amount of factory capacity is locked behind story progression and sub-base unlocks. The Jingyu Valley sub-base is essential for early bill generation.
• Check monitoring station missions. Delivery quests and monitoring missions give crucial early-game bills while building out automation.
• Learn to love the pipe splitter. Splitters with the right ratio settings turn fragile chains into bulletproof ones.

Factory automation in Endfield is the spine of your progression. A well-oiled production line means infinite gear upgrades, unlimited refinement materials, and the satisfaction of watching a dozen reactors fire in perfect sync.