Quick answer: The Heavy Encased Frame alternate (8 Modular Frame + 10 Encased Industrial Beam + 36 Steel Pipe + 22 Concrete → 3 Heavy Modular Frame) is the best recipe once you've unlocked it — it swaps the standard recipe's heavy 120 Screws/min requirement for Concrete instead, which is cheaper to scale. Pair it with the Pure Iron Ingot and Solid Steel Ingot alternates upstream and the whole chain's raw ore needs drop roughly in half.
- free costs nothing
- cheap small cost
- setup needs preparation
- grind pays off slowly
- skip the thing to stop doing
HMF recipes at a glance
| Recipe | Inputs/min | Output/min | Note |
|---|---|---|---|
| Standard | 10 Modular Frame + 40 Steel Pipe + 10 Encased Industrial Beam + 240 Screws | 2 Heavy Modular Frame | Manufacturer, 30s cycle. Heaviest Screw demand of the three. |
| Heavy Encased Frame (alt) | 7.5 Modular Frame + 33.75 Steel Pipe + 9.375 Encased Industrial Beam + 20.625 Concrete | 2.8125 Heavy Modular Frame | Manufacturer, 64s cycle. Drops Screws entirely for Concrete — the pick this guide's build uses. |
| Heavy Flexible Frame (alt) | 18.75 Modular Frame + 11.25 Encased Industrial Beam + 75 Rubber + 390 Screws | 3.75 Heavy Modular Frame | Manufacturer, 16s cycle. Highest per-machine output, but needs a Rubber line and even more Screws than standard. |
Heavy Encased Frame is the common recommendation: it removes Screws (the recipe's worst bottleneck) in favor of Concrete, which scales easily off a Limestone node and the Wet Concrete alternate. Heavy Flexible Frame pushes output per machine higher still, but only makes sense if you already have Rubber flowing and can absorb an even heavier Screw demand.
Full factory ratios (this build's layout)
| Stage | Recipe used | Machines | Output |
|---|---|---|---|
| Iron Ingot | Pure Iron Ingot (alt) | 9 Refineries | ~305 Iron Ore/min → 585 Iron Ingot/min |
| Concrete | Wet Concrete (alt) | Refineries, shared pipeline | 80 Concrete/min per Refinery bank, off one Limestone node |
| Steel Ingot | Solid Steel Ingot (alt) | 12-13 Foundries | 40 Iron Ingot + 40 Coal/min → 60 Steel Ingot/min each |
| Iron Plate | Steel Cast Plate (alt) | 3 Foundries | 3 plates per steel ingot vs. 2 plates per 3 ingots standard |
| Iron Rod | Steel Rod (alt) | Constructor bank | ~68 Iron Rod/min |
| Screws | Steel Screw (alt) | 2 Constructors | Small steel input, large Screw yield, used elsewhere in the base |
| Reinforced Iron Plate | Bolted Iron Plate (alt) | 2 Assemblers | ~23 Reinforced Iron Plate/min |
| Modular Frame | Standard | 4 Assemblers | 2 Modular Frame/min each |
| Encased Industrial Beam | Encased Industrial Pipe (alt) | ~2.5 Assemblers + 6 Constructors (Steel Pipe) | 4 Encased Industrial Beam/min per Assembler |
| Heavy Modular Frame | Heavy Encased Frame (alt) | 1 Manufacturer (slightly overclocked) | 3 Heavy Modular Frame/min |
Choosing a location with a light resource footprint
The build in this guide runs off a genuinely small footprint: one iron node, a handful of coal nodes, and a single limestone node, none of them pure. That's deliberate — the whole point of stacking alternate recipes through this build is that it needs far less raw ore than the default recipes would, so a Heavy Modular Frame factory doesn't have to sit on a rare, high-purity node cluster.
Doubling iron ore with the Pure Iron Ingot alternate
Instead of Smelters, this build runs nine Refineries on the Pure Iron Ingot alternate: 7 Iron Ore + 4 Water → 13 Iron Ingot per craft, scaling to 35 Iron Ore and 20 Water per minute for 65 Iron Ingot per minute at full clock — confirmed on the current Satisfactory Wiki. Against the standard 1:1 Smelter recipe, that's close to double the ingots from the same ore, which is why this build needs roughly 305 Iron Ore per minute rather than the much higher figure a standard-recipe build would demand from the same output target. The same Refinery floor also runs the Wet Concrete alternate (6 Limestone + 5 Water → 4 Concrete, scaling to 100 Water and 120 Limestone per minute for 80 Concrete per minute, also wiki-confirmed) off a single Limestone node, with three Water Extractors comfortably supplying every Refinery in the build through one shared pipeline.
Steel: 50% more output from the same ore
Steel production runs through the Solid Steel Ingot alternate: 2 Iron Ingot + 2 Coal → 3 Steel Ingot per craft on a Foundry, scaling to 40 Iron Ingot and 40 Coal per minute for 60 Steel Ingot per minute — confirmed on the current Satisfactory Wiki, and roughly 50% more steel per unit of iron ore than the standard recipe once you account for the Pure Iron Ingot doubling upstream. The build runs 13 Foundries' worth of this recipe (achievable with 12 Foundries plus overclocking, or 13 exactly), which deliberately overproduces steel ingots well beyond what this specific factory consumes — a surplus the video treats as a feature rather than a problem, since steel feeds so many other builds later on. See our Steel Production guide for standalone steel layouts if you'd rather build that line separately.
The basics: plates, rods and screws made from steel instead of iron
Because steel is so plentiful in this build, the basic parts feeding everything else — Iron Plates, Iron Rods and Screws — are made from steel rather than raw iron wherever an alternate allows it. Three Foundries run the Steel Cast Plate alternate (getting three plates out of a single steel ingot, against two plates from three ingots on the standard recipe), a Constructor bank runs the Steel Rod alternate for the roughly 68 Iron Rods per minute the build needs, and two Constructors cover Screws with the Steel Screw alternate, which the video specifically favors because a small amount of steel yields a large quantity of screws — useful given how screw-hungry the Heavy Modular Frame recipe is downstream. None of these alternates are strictly required; each can be swapped back to its standard iron-ore version if you haven't unlocked the Hard Drive for it yet, at the cost of needing more raw iron ore to hit the same targets.
Reinforced Iron Plate and Modular Frame
The Iron Plates from the previous step feed into Reinforced Iron Plate production using the Bolted Iron Plate alternate, which doesn't change the underlying recipe so much as triple the plate output per Assembler — reducing the machine count needed for the roughly 23 Reinforced Iron Plate per minute this build requires down to just two Assemblers. From there, Modular Frame uses the standard recipe (3 Reinforced Iron Plate + 12 Iron Rod → 2 Modular Frame per craft on an Assembler, scaling to 3 Reinforced Iron Plate and 12 Iron Rod per minute for 2 Modular Frame per minute at full clock — confirmed on the current Satisfactory Wiki) across four Assemblers, deliberately kept as the default recipe here for simplicity even though several good Modular Frame alternates exist — see our Modular Frame guide for that comparison.
Encased Industrial Beam: swapping beams for pipes
Encased Industrial Beam is where the concrete and steel pipe production earns its keep: the standard recipe needs 3 Steel Beam + 6 Concrete per Encased Industrial Beam, but the Encased Industrial Pipe alternate swaps in 6 Steel Pipe + 5 Concrete → 1 Encased Industrial Beam per craft on an Assembler (15 seconds, scaling to 24 Steel Pipe and 20 Concrete per minute for 4 Encased Industrial Beam per minute — confirmed on the current Satisfactory Wiki), which costs meaningfully less steel overall since pipes are cheaper to produce per steel ingot than beams. About two and a half Assemblers' worth of this recipe covers the build's needs, alongside six Constructors making the Steel Pipes it consumes using the standard recipe and a single Assembler making Rotors on the side for use elsewhere in the base.
The finale: Heavy Modular Frame via the Heavy Encased Frame alternate
Everything converges on one Manufacturer running the Heavy Encased Frame alternate: 8 Modular Frame + 10 Encased Industrial Beam + 36 Steel Pipe + 22 Concrete → 3 Heavy Modular Frame per craft (64 seconds, scaling to 7.5 Modular Frame, 9.375 Encased Industrial Beam, 33.75 Steel Pipe and 20.625 Concrete per minute for 2.8125 Heavy Modular Frames per minute at full clock — confirmed on the current Satisfactory Wiki). That 2.8125 figure is why the video slightly overclocks this single Manufacturer to hit a clean 3 Heavy Modular Frames per minute.
This factory produces more than just Heavy Modular Frames
Because this build runs full production lines for Modular Frames, Steel Pipes, Encased Industrial Beams, Reinforced Iron Plates, Iron Rods and Screws to feed the final Manufacturer, roughly half of everything it produces is useful on its own for other builds elsewhere in the base — not just the finished Heavy Modular Frame. The video deliberately keeps total output modest (a handful of Heavy Modular Frames, Rotors and spare pipes per minute) rather than scaling for a train line, on the reasoning that outputs this small are better suited to drone delivery than dedicating a whole train route to them.
FAQ
What is the best Heavy Modular Frame recipe? Heavy Encased Frame (8 Modular Frame + 10 Encased Industrial Beam + 36 Steel Pipe + 22 Concrete → 3 Heavy Modular Frame) is the usual pick once unlocked — it trades the standard recipe's heavy Screw demand for Concrete, which is cheaper to scale. Heavy Flexible Frame has higher per-machine output but needs a Rubber line and an even heavier Screw demand than standard, so it's a narrower fit.
How do I cut raw ore use for Heavy Modular Frames in half? Stack three alternates: Pure Iron Ingot (65 Iron Ingot per 35 Iron Ore, instead of 1:1), Solid Steel Ingot (60 Steel Ingot per 40 Iron Ingot + 40 Coal, more efficient on Coal), and Heavy Encased Frame for the final step. Together they roughly halve the raw ore needed for the same Heavy Modular Frame output.
What's the standard Heavy Modular Frame recipe? 10 Modular Frame + 40 Steel Pipe + 10 Encased Industrial Beam + 240 Screws → 2 Heavy Modular Frame/min on a Manufacturer. It needs no Hard Drive unlock but has the heaviest Screw demand of the three recipes.
Why use Pure Iron Ingot instead of the standard Smelter recipe? Pure Iron Ingot turns 35 Iron Ore into 65 Iron Ingot/min — nearly double the standard 1:1 Smelter ratio — at the cost of needing a Refinery and a Water supply instead of a plain Smelter.
Can I build this without any alternate recipes? Yes, but you'll need significantly more raw iron, coal and limestone to hit the same Heavy Modular Frame output, since every alternate in this build exists specifically to reduce the ore footprint. Swap any step back to its standard recipe if you haven't unlocked the Hard Drive for it yet.
Sources
The Pure Iron Ingot alternate (7 Iron Ore + 4 Water → 13 Iron Ingot, 65/min), the Wet Concrete alternate (6 Limestone + 5 Water → 4 Concrete, 80/min), the Solid Steel Ingot alternate (2 Iron Ingot + 2 Coal → 3 Steel Ingot, 60/min), the standard Modular Frame recipe (3 Reinforced Iron Plate + 12 Iron Rod → 2 Modular Frame, 2/min), the standard Heavy Modular Frame recipe (10 Modular Frame + 40 Steel Pipe + 10 Encased Industrial Beam + 240 Screws → 2/min), the Heavy Encased Frame alternate (7.5 Modular Frame + 9.375 Encased Industrial Beam + 33.75 Steel Pipe + 20.625 Concrete → 2.8125/min) and the Heavy Flexible Frame alternate (18.75 Modular Frame + 11.25 Encased Industrial Beam + 75 Rubber + 390 Screws → 3.75/min) are all confirmed on the current Satisfactory Wiki. The Encased Industrial Pipe alternate (24 Steel Pipe + 20 Concrete → 4 Encased Industrial Beam/min) is also wiki-confirmed. The Steel Cast Plate, Steel Rod and Steel Screw alternates, the specific machine counts, and every build technique described come directly from the source video's own on-screen factory.
Read next
- Satisfactory Best Alternate Recipes Guide — every alternate used in this build, compared
- Satisfactory Modular Frames Production Guide — the input this whole chain is built on
- Satisfactory Steel Production Guide — standalone steel layouts for this chain
Frequently asked
Why are Heavy Modular Frames such a common bottleneck in Satisfactory?
Because the recipe needs four separate input chains — Modular Frames, Steel Pipes, Encased Industrial Beams and Screws — all converging on one Manufacturer at the same time. Any one chain falling behind stalls the whole line, and Heavy Modular Frames are also a required Space Elevator shipment, so the chokepoint can't be skipped.
What does the Pure Iron Ingot alternate recipe do for a Heavy Modular Frame build?
It converts 7 Iron Ore and 4 Water into 13 Iron Ingot per craft on a Refinery, scaling to 65 Iron Ingot per minute — close to double the output of the standard 1:1 Smelter recipe from the same ore, which is why this build needs a much smaller iron node footprint.
How much better is the Solid Steel Ingot alternate than the standard steel recipe?
It produces 2 Iron Ingot and 2 Coal to 3 Steel Ingot per craft on a Foundry, scaling to 60 Steel Ingot per minute — roughly 50% more steel per unit of iron ore than the standard recipe once you account for the Pure Iron Ingot doubling upstream.
What does the Heavy Encased Frame alternate recipe trade off against the standard recipe?
It swaps a heavy Screw requirement for Concrete instead: 8 Modular Frame, 10 Encased Industrial Beam, 36 Steel Pipe and 22 Concrete produce 3 Heavy Modular Frame per craft, scaling to 2.8125 per minute at full clock versus 2 per minute on the standard recipe — a genuinely different bottleneck depending on which belt is already under pressure.
Do I need every alternate recipe in this build to make Heavy Modular Frames?
No — none of the alternates are strictly required. Each can be swapped back to its standard iron-ore version if you haven't unlocked the matching Hard Drive yet, at the cost of needing more raw iron ore to hit the same output targets.
What is the best Heavy Modular Frame recipe?
Heavy Encased Frame (8 Modular Frame + 10 Encased Industrial Beam + 36 Steel Pipe + 22 Concrete to 3 Heavy Modular Frame) is the usual pick once unlocked, it trades the standard recipe's heavy Screw demand for Concrete, which is cheaper to scale.