When is injection moulding cheaper than 3D printing?

Injection moulding typically becomes more cost-effective than 3D printing at volumes between 75 and 150 units. While the initial tooling at Nordmould starts from €3,000, the significantly lower unit price quickly offsets the setup cost as production scales.

What is the minimum order quantity for injection moulding at Nordmould?

Nordmould accepts orders from 100 pieces. This makes it an option for low-volume bridge production between prototyping and full-scale industrial runs.

How long does it take to get injection moulded parts?

Total lead times for injection moulding generally range from 4 to 11 weeks. This includes the DFM review, mould design, CNC machining of the tool, and shipping of the T1 samples to your facility in the Nordic region.

Can urethane casting be used for production-grade parts?

Urethane casting is best suited for 10–50 units where material properties similar to ABS or TPE are needed. However, it is a manual process with higher unit costs than injection moulding, which Nordmould recommends for anything over 100 units.

Does Nordmould provide free design support?

Yes, Nordmould offers a free DFM (Design for Manufacturability) review. When you submit your STEP or PDF files, engineers provide a written note to help optimise your part for the moulding process.

Is 3D printing suitable for end-use functional parts?

3D printing is excellent for validation and low-stress components. However, for parts requiring isotropic strength, certified flame retardancy, or high-gloss finishes, injection moulding is recommended once the design is finalised.

Injection Moulding vs 3D Printing vs Urethane Casting: Which Process Wins?

3D printing is the standard choice for 1–10 unit prototypes. Urethane casting bridges the gap at 10–50 units. For volumes above 100 units requiring industrial-grade durability and low unit costs, injection moulding is the only production-grade option.

How do these processes compare head-to-head?

Feature	3D Printing (SLS/FDM)	Urethane Casting	Injection Moulding
Optimal Volume Range	1 – 20 units	10 – 50 units	100 – 100,000+ units
Initial Tooling Cost	€0	€500 – €1,500	From €3,000
Unit Cost at 1,000 pcs	High (e.g. €40+)	Medium (e.g. €15+)	Very Low (e.g. €0.80+)
Typical Lead Time	2 – 5 days	2 – 3 weeks	4 – 11 weeks
Tolerances	`±0.2 mm`	`±0.1 mm`	Down to `±0.05 mm`
Surface Finish	Matte, layered	Smooth, textured	Matt, glossy, high-gloss
Material Choice	Limited (Resins/Nylon)	Polyurethane resins	Very broad (ABS, PC, PP, etc.)

When should you use 3D printing for your project?

3D printing — specifically SLS and FDM — is the fastest route from CAD to physical part. It is the primary tool for the Rapid service tier at Nordmould, where the focus is on speed and geometry verification.

What are the benefits of 3D printing for prototyping?

3D printing wins when the design is still fluid. If you are iterating daily, the lack of fixed tooling allows for rapid failure and correction. It is also the only process capable of producing complex internal lattices or geometries that cannot be demoulded in a traditional tool. For Nordic engineering teams, this means testing a concept in days rather than weeks.

What are the material limitations of 3D printing?

Most FDM parts lack the isotropic strength of injection-moulded parts because the layers create inherent weak points. SLS (Nylon) is better but results in a porous surface that requires post-processing to be airtight or watertight. If your product needs to withstand high stress or environmental exposure, 3D printing is usually only a temporary solution.

Why is urethane casting considered a bridge process?

Urethane casting (also known as vacuum casting) uses a 3D-printed master pattern to create a silicone mould. Hardware startups in Sweden, Finland, and Norway frequently use it for small batches of high-quality parts for field testing.

How does urethane casting mimic production materials?

Polyurethane resins are formulated to mimic the properties of production plastics like ABS, PC, and TPE. While they are not identical, they offer similar shore hardness and impact resistance. This makes urethane casting useful for 20–50 units where the look and feel must match the final production intent.

What is the lifespan of a silicone mould?

A silicone mould typically lasts for 20–25 shots before the chemical reaction of the resin degrades the interior surface. Once the mould fails, a new one must be cast from the master pattern. This manual labour increases the cost for higher volumes, which is why injection moulding is recommended for any order over 100 pieces.

What is the volume break-even point for injection moulding?

The break-even point is the volume where the high initial investment of injection moulding is offset by its very low unit cost.

How do tooling costs impact the break-even point?

At Nordmould, mould prices start from €3,000. While this is a significant upfront cost compared to €0 for 3D printing, the unit cost for a moulded part might be €1.00 compared to €50.00 for a 3D-printed equivalent. In this scenario, the break-even occurs at approximately 62 units.

Why does the Nordic market favour injection moulding for 100+ units?

In the Nordic context, where labour costs are high, the automation of injection moulding provides a significant advantage. 3D printing requires manual support removal and cleaning, while urethane casting is a labour-intensive manual pour process. Injection moulding runs largely unattended, ensuring the lowest possible cost per part as volumes scale.

Worked Cost Example: Electronics Enclosure Comparison

Consider a two-part ABS enclosure (120 mm × 80 mm × 30 mm) for a smart-metering device destined for the Baltic market. We compare the total project cost at 100 units across all three processes.

Option 1: 3D Printing (SLS Nylon)

Tooling Cost: €0
Unit Cost: €65.00
Total for 100 units: €6,500.00
Lead Time: 5 working days.
Verdict: Fast but extremely expensive at this volume. Surface is porous and requires painting for a professional look.

Option 2: Urethane Casting

Master Pattern & 4× Silicone Tools: €1,800.00
Unit Cost: €22.00
Total for 100 units: €4,000.00
Lead Time: 3 weeks.
Verdict: Good surface finish, but the unit cost remains high due to manual labour.

Option 3: Nordmould Injection Moulding (Aluminium Tool)

Tooling Cost (from): €3,200.00
Unit Cost: €1.50
Total for 100 units: €3,350.00
Lead Time: 6 weeks.
Verdict: Most cost-effective at 100 units. The parts are made of production-grade ABS with high-gloss finish options.

When should you choose each manufacturing method?

3D Printing:

Total volume is less than 20 units.
Parts are needed in less than 7 days.
The design is likely to change significantly within the next two weeks.
The part geometry contains complex internal channels that cannot be machined.

Urethane Casting:

You need 20–50 units for a marketing demo or investor pitch.
The surface finish must look like a production part without the €3,000 tooling investment.
You need to test different material hardness levels (shore) before committing to a final tool.

Injection Moulding:

You need more than 100 units.
The part must be made of a specific engineering plastic like glass-filled Nylon or Polycarbonate.
The product requires high dimensional stability and tight tolerances down to ±0.05 mm.
You are aiming for the lowest possible unit cost for long-term production in the Baltic region.

How does surface finish impact the choice of process?

Surface finish is often the deciding factor for consumer-facing products. 3D-printed parts always show layer lines unless significant manual sanding and painting are performed. Urethane casting provides a smooth finish, but it is limited by the quality of the master pattern.

Injection moulding allows precise control over surface texture. You can choose from matte finishes that hide fingerprints to high-gloss, mirror-like finishes for clear parts. Because the texture is machined directly into the metal tool, every part in the run has an identical finish — impossible to achieve with manual prototyping methods.

Frequently asked questions

What is the minimum order quantity for injection moulding?

Nordmould accepts orders from 100 pieces. Below this volume, the overhead of setting up the press and the initial tooling cost typically makes the unit price impractical for most B2B clients in the Nordic region.

Can I use the same CAD file for 3D printing and injection moulding?

No. 3D printing is an additive process that can handle almost any shape. Injection moulding is a form-based process that requires draft angles and uniform wall thicknesses. Nordmould provides a free DFM review to help you transition your design.

Why is there such a range in lead times (4–11 weeks)?

Part complexity dictates the lead time. A simple open-shut mould for a plastic spacer may take only 4 weeks. A complex enclosure with side-actions or sliders for undercuts can take 11 weeks to manufacture, assemble, and tune.

Does Nordmould offer bridge tooling?

Yes. Nordmould uses high-grade aluminium or P20 steel for bridge tooling. This allows faster CNC machining than hardened tool steel while still providing a tool life of 5,000 to 50,000 shots, making it suitable for the 100–5,000 unit range.

How do I reduce my initial moulding cost?

The best way to stay near the €3,000 starting price is to simplify your part's geometry. Eliminate undercuts that require expensive slides, keep the part size within 200 mm, and opt for a standard matte surface finish rather than high-gloss optical polishing.

Is injection moulding more sustainable than 3D printing?

In a production context, injection moulding is often more sustainable. It generates very little waste as scrap can be reground and reused. In contrast, 3D printing processes like FDM or SLA require significant support structures that are discarded after the build.

What are the typical tolerances for Baltic-made injection moulds?

Nordmould typically works to ISO 2768-m (medium) standards as a baseline. For critical dimensions in engineering plastics like POM or Polycarbonate, tolerances down to ±0.05 mm can be held depending on the part geometry and cooling requirements.

Contact Nordmould today for a free DFM review or a fast written quote for your next project.