Industries & Impact
How Much Does a One-Off Metal Casting Cost?
There is no flat per-part price for a custom casting — the number is built from part weight, the alloy you specify, geometric complexity and cores, finish machining, and required inspection. On a single part, the dominant variable is normally tooling: a traditional pattern can add thousands of dollars and weeks of delay before the first pour. One Off Castings — a short-run foundry and division of Southern Cast Products — pours from 3D-printed sand molds with no pattern, which removes that tooling cost and is why a quantity of one is economical here.
Who this is for
This page is written for the engineer, buyer, or maintenance planner trying to budget a one-off or short-run casting before requesting a quote — someone who needs to know what actually moves the price so the estimate is not a surprise. If you have a part, a model, or a failed component and you are wondering whether a single casting is a few hundred dollars or a few thousand, the cost drivers below explain what we are pricing and why.
The short answer
A one-off casting is not sold at a catalog price. The quote is assembled from a handful of drivers: how much metal the part (and its gating) weighs, the alloy you specify, how complex the geometry is and how many cores it needs, how much of it must be finish-machined to tolerance, and what inspection and documentation you require. The single biggest cost on a traditional one-off is the pattern tooling — and patternless 3D sand printing removes it, so on a quantity of one you are not paying for a pattern you would use exactly once.
The seven things that set the price
- Part weight and poured weight. You pay for the metal in the finished part plus the gating, risers, and feeders needed to fill and feed it soundly. A heavy, thick-sectioned part costs more in metal and melt energy than a light one — and complex feeding can push poured weight well above finished weight.
- The alloy you specify. Cost per pound climbs roughly from gray iron (ASTM A48) and ductile iron (ASTM A536), to carbon and low-alloy steel (ASTM A27 / A148), to stainless and duplex grades (ASTM A743 CF8M, A890 / A995). You or your engineer choose the grade; we pour to it and quote accordingly — we do not select the material for you.
- Geometry, wall sections, and cores. Thin walls, deep pockets, internal passages, and undercuts drive the number of sand cores and the mold complexity. Every core is a piece to print, set, and inspect. A simple bracket is cheap to mold; a manifold with internal galleries is not.
- Tooling — and why patternless changes the math. A conventional casting needs a pattern and often core boxes before the first pour. That is a fixed cost amortized over the run: painful on one part, trivial over 10,000. A 3D-printed sand mold is generated straight from your CAD, so the pattern line item effectively goes to zero on a one-off. This is the core reason a single custom part is affordable here.
- Finish machining. As-cast surfaces hold general tolerances per ISO 8062-3 (commonly grade DCTG 10–12). Any feature that must fit — bores, shaft fits, bolt circles, sealing faces, keyways — is CNC-machined to your print on our in-house equipment. The more finished features and the tighter the tolerances, the more machining time in the quote.
- Inspection and documentation. A bare visual-only part is cheaper than one shipping with an MTR, a first-article inspection, and NDE such as liquid-penetrant (ASTM E165) or radiography. The acceptance package you require is a real line item — see inspection & QC.
- Quantity. Even without pattern tooling, engineering and mold setup are spread across the run. Going from one part to a handful lowers the per-part cost because the up-front engineering is amortized — which is why we quote both the single part and a small-batch price when repeat orders are likely.
Where the money does not go on a patternless one-off
The traditional quote for a single casting is dominated by two things that patternless casting removes or shrinks: the physical pattern (and its 6–10-week build) and the risk premium foundries add when they pour a brand-new geometry blind. We run every job through solidification simulation in MAGMA / NovaCast before any metal moves, so hot spots, shrink, and feeding are engineered on the screen rather than discovered in a failed pour. That upfront engineering is a modest, predictable cost — and it is far cheaper than scrapping a one-of-a-kind part.
Cost, lead time, and the tooling connection
Cost and schedule are linked through the same tooling step. Typical sand-casting lead times run about 3–5 weeks from order to delivery (Impro Precision: typical sand-casting lead times), but a conventional job first has to build a physical pattern, which adds weeks before any metal is poured. A patternless 3D-sand mold is generated straight from CAD, so that pattern-build step is removed — which is why many one-off parts here land in that same 3–5-week window. Removing the pattern saves you money and weeks at once — the same reason a quantity of one is viable.
A quick worked logic (not a price)
Say you need a single ductile-iron gear housing replicated from a worn sample. The quote would stack up roughly as: reverse-engineering (3D scan to CAD digital twin) + solidification simulation + the 3D-printed sand mold + the poured and cleaned A536 casting + CNC machining of the bores and mounting faces + dimensional inspection and an MTR. Notice what is absent: a pattern charge. Swap the alloy to CF8M stainless, add radiography, or ask for ten instead of one, and each line moves — but the structure of the estimate stays the same. That is why we need the specifics below to give you a real number.
What to send us for an accurate quote
- The part or a 3D model: the physical sample (best for legacy replication) or a STEP/IGES/STL file.
- Material: the ASTM grade or alloy to pour. If the original part’s alloy is unknown, your engineer determines the correct grade — we pour to the spec you provide, we do not select it for you.
- Critical features: the bores, faces, bolt circles, and fits that must be machined to tolerance, called out up front.
- Quantity: one is normal here; tell us if repeat orders are likely so we can quote the batch too.
- Acceptance: required NDE, inspection, and documentation (MTR, FAI, PPAP).
- Schedule: when you actually need it — downtime jobs are flagged and run hot.
You can send it over here and we will come back with a path, a real schedule, and a price.
Related reading
- One-off casting versus machining from solid — the make-or-buy comparison.
- The patternless advantage for emergency replacements — the speed side of the same tooling story.
- Robocasting vs traditional sand casting — how process choice affects short-run economics.
- Low-volume, high-complexity castings — the capability overview.
Sources & standards
- ASTM A48 — Standard Specification for Gray Iron Castings.
- ASTM A536 — Standard Specification for Ductile Iron Castings.
- ASTM A27 — Steel Castings, Carbon, for General Application.
- ASTM A148 — Steel Castings, High Strength, for Structural Purposes.
- ASTM A743 — Corrosion-Resistant Iron-Chromium-Nickel Castings (CF8M, CF3M).
- ASTM A890 / A995 — Duplex stainless castings.
- ASTM E165 — Standard Practice for Liquid Penetrant Testing.
- ISO 8062-3 — Dimensional and geometrical tolerances for moulded parts — Castings.
- Impro Precision — Typical lead times for sand casting.
FAQ
How much does a one-off metal casting cost?
There is no flat rate — the price of a single casting is built from part weight (metal poured plus gating and risers), the alloy you specify, geometric complexity and the number of sand cores, the amount of finish machining, and the required inspection and documentation. The biggest single variable on a one-off is normally tooling: a traditional pattern can add thousands of dollars and weeks of delay before any metal is poured. Patternless 3D-sand-printed molds remove that pattern cost entirely, which is why a quantity of one is economical at One Off Castings. Send the part or model to /contact-1 for a real number.
Why is patternless casting cheaper for a single part?
A conventional sand casting needs a physical pattern and often core boxes, built in wood, resin, or metal before the first pour. That tooling is a fixed cost amortized over the run — brutal on a quantity of one, cheap over 10,000 parts. A 3D-printed sand mold is generated directly from the CAD with no pattern, so the tooling line item effectively disappears. You pay for engineering, the printed mold, the metal, machining, and inspection — not for a pattern you will use once.
Does the alloy I choose change the cost?
Yes. You (or your engineer) specify the grade; we pour to it. Gray iron (ASTM A48) and ductile iron (ASTM A536) are generally the most economical per pound. Carbon and low-alloy steel (ASTM A27 / A148) cost more to melt and pour. Stainless (e.g., ASTM A743 CF8M) and duplex grades (ASTM A890 / A995) carry higher alloy and processing costs, and grades that require heat treatment add furnace time. We do not select the alloy for you — we quote whatever grade you specify.
What information do you need to give me an accurate price?
The part or a 3D model, the ASTM grade or alloy to pour, the quantity, the features that must be machined to a tolerance (bores, faces, bolt circles), any required NDE or documentation (MTR, FAI), and when you need it. The more of that we have up front, the tighter and faster the quote.
Is a one-off casting cheaper than machining the part from solid?
It depends on geometry and material removal. For bulky or hollow shapes where machining from a solid billet would cut away most of the stock, casting near-net-shape and then finishing the critical features is usually cheaper and faster. For simple prismatic parts with little material removal, machining from solid can win. See our article on one-off casting versus machining from solid for the full comparison.
Do you charge a minimum order or setup fee?
No minimum order — One Off Castings exists for the quantity-of-one job. There is engineering and mold cost baked into any casting, but there is no pattern-tooling charge on the patternless route and no requirement to buy a batch you do not need.