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3D-printed short runs: when do they become cost-effective?
With no mould or tooling, 3D printing makes short runs accessible. Here is the volume at which it becomes the right choice — and when injection moulding takes over.
Published on 28 June 2026 · 7 min read
Producing 20, 50 or 200 copies of a part: neither a one-off prototype, nor a large industrial series. This is the short-run zone, and it is precisely where 3D printing changes the game. You just need to know when it is the right tool — and when another process takes over.
What we call a short run
There is no official definition, but in practice we talk about a short run as soon as you go beyond the single part toward a few dozen to a few hundred copies. Below that, it is a prototype or a custom part. Above several thousand, you enter industrial logic.
Why 3D beats injection moulding on small volumes
The difference comes down to one word: tooling. Injection moulding, the king of large series, requires a mould. And a mould is expensive and takes time to make. That cost is fixed: whether you produce 50 parts or 50,000, you pay it in full.
3D printing has no mould. You go from file to part directly. There is therefore no start-up cost to amortise. As a result, on small volumes 3D produces at a far lower total cost, because it does not carry that initial weight.
When injection moulding becomes relevant again
Injection moulding catches up as volume climbs. Its unit cost, once the mould is paid for, becomes very low. So there is a tipping point: below it, 3D is more economical; above it, injection takes the advantage.
That point depends on the part, but the order of magnitude is clear: as long as you stay in the short-run range, 3D is almost always the right choice. The day your volumes grow durably, we will tell you plainly — and steer you toward injection moulding if needed. That is our transparency principle: if someone else does better for your need, we send you there.
What lowers the per-part price in 3D
Within a short run, the per-part price is not fixed. Several levers bring it down as quantity rises:
- Preparation is shared. File review, orientation, settings: this work is done once for the whole batch. Spread over 50 parts, it weighs far less than on a single one.
- Quantity discount. Beyond certain thresholds, our unit price drops mechanically. Between one part and around fifty, the per-part gap is clear.
- Build-plate optimisation. Several parts printed together make better use of each machine cycle.
To understand all the factors that make up a price, see our article on how much a 3D print costs.
FDM or resin for a series
The technology choice depends on the part:
- FDM: ideal for functional, mechanical or large-format parts. Often the most economical solution for a series.
- Resin: for parts that need fine detail or a smooth finish (presentation objects, small aesthetic parts).
If you are unsure, our article on FDM or resin details the criteria.
The hidden advantage: flexibility
A 3D-printed short run is not only about price. It is also a freedom that injection moulding does not allow:
- Iterate between batches. Spot an improvement after the first 30 parts? We adjust the file for the next batch, with no new tooling.
- Personalise per part. Serial number, engraving, colour variant: each copy can differ at no tooling surcharge.
- Produce on demand. No stock tied up: we run a batch when you need it.
For a project still evolving, this is often decisive. It is also why many clients move from rapid prototyping to a short run without changing workshop.
How to estimate your series
The simplest way is to start from your real case: a part, a quantity, a material. Start an online estimate for a first ballpark, or tell us about your project for a detailed quote. We calibrate the technology, the material and the batching to your need.
Frequently asked questions
From how many parts is it a short run?
In practice, from a few copies up to a few hundred. Below that, it is a one-off or a prototype; above several thousand, industry takes over.
Is a 3D-printed short run cheaper than injection moulding?
On small volumes, almost always, because 3D has no mould cost to amortise. Injection only becomes attractive again at high, stable volumes.
Does the per-part price drop with quantity?
Yes. Preparation is shared and our unit price steps down as quantity rises. The gap is already noticeable between one part and a few dozen.
Can the part be modified mid-series?
Yes, it is one of the great advantages of 3D: we adjust the file between batches with no new tooling. Ideal for a product still evolving.