Where does unit cost drop on a second production run, and which cuts pay off?

A second production run usually costs less per unit even if you change nothing: one-time costs you already paid, such as molds, fixtures and setup engineering, aren't paid again, setup spreads over more units, larger orders get better part prices, and a planned run can go by sea instead of air. Further cost-down needs a change that costs money up front, such as more mold cavities, a merged board or cheaper battery cells, and some changes need new samples or new testing. A change pays off when its payback in units, the one-time cost divided by the savings per unit, is lower than the number of units you're confident you'll sell. For injection-molded parts, the main cost-down changes are more cavities per mold, a hot runner, and molding in a texture, color or logo instead of painting and pad printing; extra cavities rarely pay off at a few thousand parts. Some costs can also rise between runs: chip prices, duty and the exchange rate.

Which costs drop on their own, and which need a change?

The table lists where unit cost can drop on a second run, whether the product has to change, what it takes, and whether each drop is usually worth it at a few thousand units a run.

Where the cost drops	Product change needed?	What it takes	Worth it at a few thousand units a run?
One-time costs already paid: molds, fixtures, setup engineering, certification	No	Asking for the second-run price without them	Yes
Per-order setup, spread over more units	No	Ordering more per run, and carrying the stock	Yes, if you can carry the stock
Component price tiers	No	Cash for the larger buy, and the risk of leftover parts	Yes
Quoted prices on the costliest parts	No	Time, and an honest annual forecast	Yes, for the few parts that cost the most
Molded part price at the cycle time actually run	No	Asking the molder for the cycle time it measured	Often
Assembly, test and programming time	No	Asking the factory to pass the gain on; sometimes chips that arrive already programmed	A small gain
Inspection	No	Dropping extra checks added for the first run, agreed in writing	A small gain
Freight and packaging	No	Weeks of extra lead time by sea, sometimes a smaller box	Often
Secondary operations: painting, pad printing, pressed-in inserts	Yes	A small mold change and new samples	Often
Cheaper or fewer parts: alternates on the same footprint, fewer unique parts	Yes	A check build, sometimes new testing	It depends on the testing
More mold cavities, or a hot runner	Yes	A new mold or new inserts, and new samples	Rarely: one mold maker puts the payoff above about 10,000 to 20,000 parts
Thinner walls for faster cycles	Yes	Adding steel to the mold, which usually means new inserts	Rarely
Merging boards, moving through-hole parts to surface-mount, or any new layout	Yes	A new layout, stencil and test fixture, and FCC emissions testing again	Only with a large volume ahead
Different battery cells	Yes	New UN 38.3 transport tests, and possibly a new safety review	Only with a large volume ahead

Which costs drop on a second run without changing the product?

One-time costs you've already paid

If your first quote folded the molds, fixtures or setup engineering into the unit price, as ODMs (original design manufacturers) often do, ask for the second-run price without them, and ask how many units they were spread over. If they were invoiced separately, the first-run unit price didn't carry them, and the second-run drop comes from the other items in this section. How quotes fold these costs in is in What's actually in a production quote.

Some charges come back with every order: line setup, the first-article inspection (a full check of the first units built) and mold setup. These per-order charges weigh less on a bigger order. For example, a made-up $300 setup charge adds $0.60 a unit to an order of 500, and $0.06 a unit to an order of 5,000.

Component prices

Price tiers. Distributor prices step down at higher quantities. In vendor examples, common parts cost roughly 18 to 24% less at 10,000 than at 1,000.
Quoted prices on the costliest parts. A distributor can ask the chip maker for a project price below the catalog price. Chip makers price on annual volume, so give the annual figure, not only the order. A few parts, such as the processor, radio module, display and battery, usually make up most of the parts cost, so start there.
Full reels. If you bought small parts such as resistors and capacitors yourself for the first run, full reels cost far less than cut lengths of tape. A factory that buys the parts usually uses reels already.
Life-cycle status. Before you reorder, check each part's status with the maker. A part marked end-of-life, or not recommended for new designs, may not be there for a third run.
Leftover parts. Parts left from minimum buys on the first run should go into the second. Who pays for them is covered in Who buys the parts for a first production run.

Molded parts

Molders often quote a cautious cycle time for a first run. After the run they know the real one, so ask for the piece price at the cycle time they actually ran, if it's shorter than quoted. It costs nothing and changes no steel.

Labor, test and programming

Repeat builds go faster: in repetitive electronics assembly, labor per unit typically falls by 5 to 10% each time the total number built doubles. But labor is usually a small share of the cost of an electronic product built by a contract manufacturer, a long gap between runs loses some of the gain, and a factory that quotes standard times won't pass it on unless you ask. Test and programming time can cost more than assembly on a small electronic product. Once the first run's yield is known, ask whether a long test or burn-in can be shortened, or whether chips can arrive already programmed from the distributor.

Yield and inspection

Problems fixed after the first run, such as an adjusted fixture or a replaced part that kept failing, mean fewer units scrapped or reworked. Inspection can come down too, mostly by dropping extra checks added for the first run, such as 100% inspection or a mid-production visit. Sampling standards such as ANSI/ASQ Z1.4 allow smaller samples only after at least ten lots in a row pass, so that comes later. Agree on any change in writing with your factory or your inspector.

Freight and packaging

A first run is often flown to meet a launch date; a planned second run can go by sea. In freight forwarders' 2026 rates from Asia to the US, air costs several times as much as ocean per kilogram, though the gap narrows once fees and delivery are added, and ocean takes about five weeks door to door against about one for air. A product with a lithium battery inside also ships under dangerous-goods rules, which limit carriers and add fees, especially by air. Air freight is charged on the larger of the actual weight or the volume weight (length × width × height in centimeters ÷ 6,000), so a smaller box and more units per carton cut the cost per unit.

Which cost reductions need a design change?

How do you cut the cost of injection-molded parts?

The press time in a molded part's price works like this: machine cost per part = the press's hourly rate × cycle time in seconds ÷ 3,600 ÷ the number of cavities (parts per cycle). With made-up rates of $60 an hour and a 30-second cycle, that's $0.50 a part with one cavity, $0.25 with two and $0.125 with four. On 3,000 parts, going from one cavity to two saves about $750 of press time, while adding a cavity usually means new inserts or a new mold. Your own break-even is the added mold cost divided by the press time saved per part. One mold maker puts the payoff of more cavities above about 10,000 to 20,000 parts, and of hot runners at around 20,000 to 30,000. A hot runner is a heated channel that feeds plastic into the mold, so there's little or no cold runner: the channel of solid plastic that is otherwise cut off each cycle and scrapped or reground.

Thinner walls cool faster, and cooling takes most of the cycle. But an existing mold is easy to change in only one direction. Removing steel makes a wall thicker or adds a rib; making a wall thinner means adding steel back, usually with new inserts. That's why molds are cut "steel-safe", as explained in Moving from a 3D-printed prototype to injection molding.

Secondary operations

Painting, pad printing and pressed-in threaded inserts each add a step and a cost to every part. A molded-in texture or color, a laser mark or a label, and snap fits or thread-forming screws can replace them, often with a small mold change. On an existing mold, a raised logo on the part is the cheap kind, because it's cut into the mold; a recessed one needs steel added.

Parts and the board

Alternate parts on the same footprint and fewer unique parts change only the parts list, but each still needs a build to check it. Moving through-hole parts to surface-mount, or merging two boards into one, changes the layout: a new stencil, often a new test fixture, and emissions testing again if the product's FCC compliance rests on tests of the old board. If the radio is an FCC-approved module, keep its antenna and the layout around it within the conditions of the module's FCC grant; moving the antenna or redrawing a trace antenna can need a filing by the module maker or an FCC ID of your own. If the product carries its own FCC ID because of a radio designed onto the board, the FCC's rules on permissive changes, its process for changes to approved radio equipment, decide whether a change needs a filing or a new FCC grant.

Battery

Cheaper cells, a different cell maker or a changed pack usually count as a new battery type, which needs new UN 38.3 tests before it can ship, and possibly a new safety review. See Who buys the parts for a first production run.

How do you tell whether a cost-reduction change pays off?

Payback in units = the one-time cost of the change ÷ the savings per unit. Compare that with the units you're confident you'll sell while the change is in use. Count every one-time cost: engineering time, mold changes, new fixtures and stencils, testing again, a check build, scrapped old parts and a new golden sample (the approved unit the factory checks production against). Bundle changes into one revision, so you pay for a check build and sample approval once.

What can cost more on the second run?

A smaller order. If the second run is smaller than the first, per-order setup and part minimums weigh more on each unit.
A mold that won't last the run. An aluminum or bridge mold may not survive a larger order, and a steel mold is a new one-time cost. See 100 to 1,000 units: bridge tooling, urethane casting or machining?
Chip prices. In 2026, for example, memory and flash chips became much more expensive as supply tightened, so a product with memory can cost more to build the second time.
Duty. It's charged at the rate in force when the goods are imported, not when you got your first quote. New or modified molds you pay for can add to the customs value, as explained in What's actually in a production quote.
The exchange rate and quote validity. A quote in, or built on, another currency moves with it, and component prices are usually re-quoted with each order.
Mold upkeep. Cleaning, repairs and worn parts.
Parts that reach end of life, and the redesign they force.

What should you ask a factory for in a second-run quote?

Prices at your planned quantity and at two higher ones, with your annual forecast.
The unit price without the one-time costs you've already paid, and a list of the charges that come back with every order.
A breakdown of parts, labor and overhead, if the factory will share it.
Quoted prices on the five most expensive parts, and the life-cycle status of every part.
What the factory learned on the first run: the yield, the rework, the failures and what it would change.
From the molder, the cycle time it actually ran, and the piece price at that cycle time.
Sea freight, and how many units go in each carton.
How savings the factory finds are shared. Some contracts give the factory a share for a few months, then pass all of it to the customer.
Whether a larger total order, released in batches, earns a better price tier, and who pays for parts bought for later batches if you stop.
A quote from a second factory for the same package. Even if you stay, it shows where the price should be. If you move, count the cost of moving the molds and checking them on the new press, moving or rebuilding fixtures, a new first-article inspection and golden sample, and adding the factory to any safety listing. Ask whether you own the molds and fixtures, and whether the first factory will release them.

Example: a second run of 3,000

This is an illustration, not a customer project. The product and all the numbers are made up.

A team built 1,000 units of a handheld sensor. The factory price was $40.00 a unit: $21.00 of parts, $4.00 of molded parts (the molds were invoiced separately), $5.00 of assembly, test and packing, $1.50 of per-order setup, $6.00 of fixtures and setup engineering folded into the price, and $2.50 of the factory's overhead and margin. Air freight added $3.00, for $43.00 a unit delivered, before duty.

For a second run of 3,000, with no change to the product:

Fixtures and setup engineering already paid: −$6.00.
Per-order setup over 3,000 units: $0.50 instead of $1.50, so −$1.00.
Larger component buys: −$2.20. Quoted prices on the three most expensive parts: −$0.80.
Faster assembly, after asking the factory to pass it on: −$0.50.
Sea freight, $0.90 instead of $3.00: −$2.10.
The memory chip went up: +$0.70.

In this made-up example, that's about $31.10 a unit delivered, before duty, against $43.00 on the first run, if the factory passes all of these on, which takes asking. Then they look at changes:

A raised logo cut into the mold instead of pad printing: a $1,200 mold change that saves $0.35 a unit pays back after about 3,400 units. Worth doing if a third run is likely.
A second cavity in the main case mold: $9,000 to save $0.30 a unit needs 30,000 units. Not at this volume.
Two boards merged into one: $18,000 for the layout, stencil, test fixture and emissions testing, to save $1.80 a unit, needs 10,000 units.
Cheaper battery cells: $9,000 for new UN 38.3 tests and pack approval, to save $0.60 a unit, needs 15,000 units.

They take the drops that need no change, make the logo change, and plan the board merge and the battery change together as a version 2. Bundled, the two cost $27,000 and save $2.40 a unit, about 11,000 units to pay back, a little less if one check build and one sample approval cover both. So version 2 waits until they expect to sell another 12,000 units or more.

Where we come in

If you're planning a second run or a version 2, this is one of the situations Anamor takes on. We work on runs from pilot runs of dozens to production runs of thousands and more. We can check the changed mechanical design: we check your STEP files for fit, clearance, tool access and manufacturability, and send a report with a list of fixes. If you want us to make the fixes, we can do that too.

Anamor takes US hardware teams with a working prototype into their first production run: we redesign the product for production, line up partner factories and suppliers in the US and overseas, price it at your quantities, and run the build through to shipping.

Send what you have: photos of the product, CAD if you have it, the parts list, your last quote, and how many you plan to make next. Need an NDA? We'll send our mutual NDA, or review yours, before you send files. Within two business days, a real person on our team will reply with a free first look at your production run and a few times to talk.

Frequently asked questions

How do you reduce the cost of injection-molded parts on a repeat order?

Without touching the mold: order more per run, and ask for the piece price at the cycle time actually run. With small design changes, mold in a texture, color or logo instead of painting or pad printing. Extra cavities or a hot runner usually pay off only above about 10,000 to 20,000 parts, by one mold maker's estimate.

How do you know if a cost-reduction change is worth it?

Divide the change's one-time cost by what it saves per unit. That's the payback in units. If it's more than the units you're confident you'll sell while the change is in use, skip it. Count every one-time cost: engineering, mold changes, fixtures, retesting, a check build, scrapped parts and a new golden sample.

Should a second-run quote still include tooling costs?

No, if you already paid for the molds, fixtures and setup engineering. When a first quote folded them into the unit price, as ODMs often do, ask for the second-run price without them and how many units they were spread over. Charges that recur every order, such as line setup and first-article inspection, stay.