500 to 2,000 plastic parts: 3D printing, injection moulding or vacuum casting?
For 500 to 2,000 plastic parts, 3D printing is slow and a mould rarely pays back. How the options compare on cost, speed, materials and finish, in Egypt and the GCC.
By BlacksmithAI · · 5 min read · اقرأ بالعربية
Key takeaways
- Between 500 and 2,000 parts is the awkward middle: too many to 3D print sensibly, too few to pay for an injection mould.
- 3D printing has no tooling, but every part takes printer time, so a run of hundreds or thousands is slow and the cost per part never falls.
- Injection moulding makes the cheapest parts at scale, but the mould is paid up front, takes weeks, and turns every design change into rework.
- Blacksmith vacuum casting, in silicone moulds we rebuilt for production, makes 500 to 2,000 production-grade parts, typically in 2 to 3 weeks from design approval. In our comparisons that is about 6.8× cheaper than injection moulding and 3.5× faster than 3D printing for runs in this range.
Why 500 to 2,000 is the awkward middle
Most manufacturing advice is written for two cases: a handful of prototypes, or production in the tens of thousands. Real businesses in Egypt and the GCC spend a lot of their time in between: a first production run of a new product, a year of spare parts for a machine, a component that used to be imported in a container and is now needed in a box.
At 500 to 2,000 parts, the two familiar options both strain. Here is why, and what we do instead.
Option 1: 3D printing
3D printing needs no tooling. You send a file and parts come off the machine, which makes it unbeatable for prototypes and for a few dozen parts. It is also why it struggles at this volume:
- Time scales with quantity. Every part takes printer hours. A run of 1,000 means a thousand parts of printer time, however many machines share it.
- Cost per part does not fall. Without tooling there is nothing to spread; the thousandth part costs about what the first did.
- Materials are close, not the same. Printing resins and powders behave differently from the moulded plastics most products are designed for.
- Finish. Depending on the process, parts show layer lines or a grainy surface and often need finishing by hand.
Option 2: injection moulding
Injection moulding is how almost every plastic part in your home was made. Molten plastic is forced into a steel or aluminium mould, and once the mould exists, parts are fast and very cheap. The catch is the mould:
- It is the biggest cost, and it comes first. The mould has to be designed, machined and tested before a single part exists.
- It takes weeks. Mould making is usually the longest part of the schedule.
- Changes are expensive. Once the steel is cut, moving a hole means modifying or remaking the mould.
- It pays back at volume. Spread over tens of thousands of parts the mould becomes cheap per part; over 500 it rarely does.
Option 3: Blacksmith vacuum casting
Vacuum casting pours polyurethane resin into a silicone mould under vacuum. The mould is taken from a master of your part, so there is no steel mould to machine, and the parts come out with detail and finish close to moulded. Its traditional limit is the mould itself, which wears after a few dozen casts. We rebuilt it for production: longer-lasting moulds, AI-designed moulds, parallel moulds cast side by side, and circular upcycling of worn silicone. The first part off every mould is scan-checked against the CAD, and parts are coloured through the resin. How our silicone moulds work.
- Quantity: 500 to 2,000 parts per run.
- Lead time: typically 2 to 3 weeks from design approval.
- Materials: PP-like (tough, slightly flexible: clips, caps, hinges), ABS-like (rigid: housings, covers, brackets), rubber-like (soft-touch: seals, grips, feet) and clear (lenses, windows, light pipes).
- Size: parts up to about 50 cm, and larger on request.
- Cost: quoted per project. For runs in this range our comparisons put vacuum casting at about 6.8× lower total cost than injection moulding once the mould is counted, and about 3.5× faster than 3D printing the same run.
It starts the way all our work does, from the part. If you do not have CAD, AI Reverse Engineering builds an editable model from photos, a scan or a STEP file: vibe-CADing carried all the way to production.
Side by side
| 3D printing | Injection moulding | Blacksmith vacuum casting | |
|---|---|---|---|
| Tooling | None | A steel or aluminium mould, paid up front | Silicone moulds taken from a master |
| 500–2,000 parts take | Long: every part is printer time | Weeks for the mould, then fast | Typically 2–3 weeks from design approval |
| Cost per part | Flat: does not fall with volume | Lowest at scale, after the mould | About 6.8× lower total cost than moulding in our comparisons |
| Materials | Printing resins and powders | The real thermoplastics | PP-like, ABS-like, rubber-like, clear |
| Finish | Layer lines or grainy, often finished by hand | Excellent, from the mould | Close to moulded |
| Design change | Free: print the new file | Modify or remake the mould | A new master and moulds from the updated CAD |
| Best for | Prototypes, up to a few dozen | Tens of thousands, design frozen | 500 to 2,000, and bridge runs |
How to choose
- Fewer than about 100 parts, or still changing the design: 3D print.
- 500 to 2,000 parts: vacuum casting. Production-grade parts without paying for a steel mould you may never fill.
- Tens of thousands, design frozen, demand proven: injection moulding. Short runs are often how you get there safely: see bridge production.
Why make it locally
For a run of this size, local production in Egypt and the GCC removes the minimum order quantities, shipping and customs that make importing a few hundred parts slow and expensive, and puts you a phone call away from the people making your part. See small-batch production for how a job runs, or replacing an imported plastic part for the single-part route.
Frequently asked questions
What is the cheapest way to make 1,000 plastic parts?
It depends on the part, but at 1,000 an injection mould rarely pays for itself and 3D printing costs the same per part however many you make. Vacuum casting usually wins in this range: in our comparisons about 6.8× lower total cost than injection moulding. Every project is quoted.
How long does a run of 500 to 2,000 parts take?
Typically 2 to 3 weeks from design approval with Blacksmith vacuum casting. Injection moulding usually needs weeks for the mould before the first part; 3D printing takes printer time for every part.
Which plastics can you make the parts in?
PP-like, ABS-like, rubber-like and clear materials, chosen for what the part has to do: flex, stiffness, soft touch or transparency.
How big can the parts be?
Up to about 50 cm, and larger on request.
Do I need a CAD file?
No. We can start from the physical part: AI Reverse Engineering builds an editable CAD model from photos, a scan or a STEP file, and you approve the design before anything is made.
Get a quote for your run
500 to 2,000 plastic parts, typically 2 to 3 weeks from design approval, made locally in Egypt and the GCC. Tell us the part, the material and the quantity.