Plastic injection moulding you can rely on

Repeatable polymer parts at volume, with the model built right before the tool is cut. Once the steel tool exists, every cycle produces an identical part, so moulding is the standard route for polymer components in volume, generally quantities over about 500 to 1,000. We can 3D print the part first to prove it in your hand, and a real engineer prices the work within 24 hours.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel
Our lead service

Reverse Engineering

Start with a worn, failed or discontinued part. We reconstruct the design and agree improvements before manufacture.

Capture the geometry

3D Scanning

Digital surface capture to support CAD reconstruction and the wider reverse engineering job.

Complex geometry

5-Axis CNC Machining

Machine angled features and complex surfaces, with the set-up planned around the critical relationships.

Prototype to production

CNC Milling

Milled housings, brackets and precision components in metals and engineering plastics.

Rotational components

CNC Turning

Stepped shafts, threaded fittings and housings, made to drawing or reverse engineered from a sample.

Prove the design

3D Printing

Bring us the application. Our engineers recommend the material and approach for your prototype or part.

Cut, fold and form

Sheet Metal

Brackets, panels and enclosures, developed around the bends, interfaces and finished assembly.

Repeat production

Plastic Injection Moulding

Moulded plastic components, with material, tool design and production requirements considered together.

Detailed metal parts

Metal Injection Moulding

Small, complex metal components where geometry and quantity suit moulding and sintering.

Cast to shape

Aluminium Die Casting

Aluminium housings and components, with casting geometry and any secondary machining planned together.

Your profile, repeated

Aluminium Extrusions

Custom sections developed for the application, then cut, machined and finished as required.

Ready to fit

Assembly

Manufactured and bought-in components brought together, with the interfaces and checks agreed first.

Joined with care

Welding

Welded components and fabrications, planned around material, joint access and distortion control.

Repeatable polymer parts at volume

Injection moulding forces molten polymer into a steel tool under pressure, then cools it to form a finished part. Once the tool exists, each cycle produces an identical part, which makes it the standard route for plastic components at volume, generally quantities over about 500 to 1,000 units. The tool is the investment. Get the part geometry right before the tool is cut, the wall thickness even, the draft angles in and the gates placed for clean flow, and the unit cost falls away across the run. Get it wrong and the cost of changing a tool is real. That is why the modelling work in front of the tool matters as much as the moulding itself, and why we can 3D print the part first to prove it before any steel is cut.

Identical parts every cycle

Once the tool is proven, every shot is the same, which is why moulding suits polymer at volume.

Print first, then tool

We can 3D print the part to prove it in your hand before you commit to cutting a steel tool.

Moulded from your sample

No drawing needed. We measure the obsolete plastic part and rebuild the model the tool is cut from.

Moulding polymers

A range of moulding polymers. Tell us the duty and we confirm the grade before the tool.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

Obsolete plastic part, no drawing, made better than the original

A tool cut from a guessed model is an expensive mistake. We build the model from your real plastic part, correct any weakness that made the original fail, then cut the tool from something proven. You get a moulded part that fits and lasts, not a copy of a flawed one.

No drawing needed

Bring us the plastic part with no paperwork. We measure it, rebuild the model it was moulded from and prove the geometry before the tool is committed.

Corrected before the tool

Where the original moulding cracked at a thin wall or a stressed boss, we correct the model before any steel is cut, so the fault is not moulded into the replacement.

What materials are available for Plastic Injection Moulding?

Plastic injection moulding is best suited to high volume parts, generally quantities over 500 to 1,000 units, and we work across a wide range of engineering thermoplastics to suit the application. For lower volumes, CNC machining, silicone moulding and resin casting are offered instead.

Please see our material lists for Plastic Injection Moulding. Looking for a material you can't find here? Get in touch to discuss your requirements.

Thermoplastics

ABS
HIPS
Nylon (PA)
Glass Filled Nylon (PA%GF...)
PC
PE / HDPE / LDPE
PEEK
PET
PMMA
POM
PP
PVC
TPU

What finishes are available for Plastic Injection Moulding?

Injection moulded parts can be finished in a range of ways depending on the tool and material, from a cost-efficient satin bead blast texture to a mirror polish for clear parts, or a custom Mold Tech grain for a specific look and feel. The options below show each finish on the same reference part. If your project needs a finish not shown here, contact us and we will discuss what is achievable.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

D1 (Satin Finish)

Bead blast finish for parts to have a cost efficient texture.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

A-2 (Mirror Polish)

Polishing surfaces can be important for clear PC parts.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

Mold Tech Textures

A wide selection of custom textures, grain and patterns.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

As Machined

CNC machining marks will be left visible on the tool and part.

Why engineers choose MV for plastic moulding

We sell the expertise that protects your tooling spend, not shot count. That means the model proven from your real part, the geometry checked for moulding before any steel is cut, and the option to 3D print the part first so you prove it cheaply. Over 100,000 parts delivered, on time or early every time, stand behind that judgement. Our engineering team plans the work together, with one point of contact keeping the job clear and coordinated. Here is what that means when you send us a plastic part.

Proven at volume

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A studio arrangement of matching complex machined manifold housings

Over 100,000 parts delivered, on time or early every time, an average of 1.5 days ahead. Once the tool is proven, every part comes off the same.

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On time or early every time
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1.5 days early on average

The founder's standard

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A studio collection of complex machined, moulded and fabricated components

Miguel came up through Cosworth, Perkins and Caterpillar before founding MV in 2020. The discipline of getting the part right before steel is cut is built into how we work.

Prototype before you tool

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Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

We can 3D print the part first, so you hold it, check the fit and prove it before committing to a steel tool. The same model then moves from print to mould when volumes justify it.

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3D print to prove it
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Print to moulded production

Built for demanding sectors

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Finished complex components securely fitted in protective transit foam

We mould housings, guards, guides and wear parts for food machinery and oil and gas, where a polymer part has to fit, seal and last in a working machine.

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Food machinery
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Oil and gas

Better than the original

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Worn and rebuilt steel gears with matching opposed keyways on a charcoal studio surface

An obsolete moulded part with no drawing is a starting point, not a dead end. We rebuild the model from the sample, correct what failed and cut the tool for a part better than the original.

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No drawing needed
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Model rebuilt from sample

From enquiry to delivered part

The injection moulding process from the part in your hand to the finished component on your bench. Four steps, one shop, an engineer on your job from the first call to delivery.

Send the part or drawing

A plastic sample, a 2D drawing or CAD. No drawing is fine. We measure the part and rebuild the model the tool will be cut from.

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Physical sample
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2D drawing
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CAD file
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No drawing needed
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Model rebuilt
Worn and rebuilt steel gears with matching opposed keyways on a charcoal studio surface

Quote in 24 hours

A real engineer reviews the part, the polymer and the volume, then prices it within 24 hours. Straight advice, and an honest steer if 3D printing suits your quantity better.

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Engineer-made quote
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24 hour turnaround
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Straight advice
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Material guidance
Complex pump housing with a surface mesh illustrating geometry capture

Prove it, then cut the tool

The geometry is checked for moulding, wall thickness, draft and gate position, and where it helps we 3D print the part first so you prove it in hand. The tool is cut, then the first part off it is inspected.

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Design for moulding
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3D printed proof
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Tool cut
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First-article check
Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

Moulded and delivered

The run is moulded to the proven tool, then delivered on time or early, an average of 1.5 days ahead, ready to fit the assembly it was made for.

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Production moulding
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Consistent parts
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On time or early
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Ready to fit
Finished complex components securely fitted in protective transit foam

Plastic injection moulding FAQs

Plastic injection moulding questions, answered

Can you mould a replacement for a part I can no longer buy?

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Yes. An obsolete moulded part is a starting point, not a dead end, because the worn sample still holds the shape the tool was cut from. We measure the original, rebuild the model, and where the part cracked at a thin wall or a stressed boss we correct that weakness in the model before any steel is cut. The tool is then cut from that proven model, so the plastic injection moulding comes out better than the original rather than a copy of a flawed one. This reverse engineering route is why OEM engineers bring us discontinued polymer parts the original maker no longer supplies. Send the worn part, with or without a drawing, and we will start from what you have.

The tooling cost worries me. How do I de-risk it?

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We protect the tooling spend two ways. First, we check the part geometry for moulding, wall thickness, draft, gate position and the way the polymer will flow and cool, before any steel is cut, because a tool cut from a guessed model is an expensive mistake and reworking a tool after the fact costs real money. Second, we can 3D print the part first, so you hold it, check the fit and prove the design cheaply before committing to a steel tool. The same model then moves from print to mould when the volume justifies the tooling. Where you are replacing an obsolete part, the sample gives us a sound starting shape rather than a guess. That is how a plastic injection moulding tool is made to work first time. Send the part and we will quote within 24 hours.

Can you go from a printed prototype to a moulded part?

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Yes. The same model moves from a 3D printed prototype to a moulded production part when the volume justifies the tool. This is one of the strengths of moulding with MV: you prove the part cheaply as a print, checking fit, form and function in your hand, then commit to a steel tool only once you are confident in the design. For low volumes a print may be all you need, and for higher volumes the moulded part carries the same geometry you already proved. Because the print and the mould come from one model, nothing is lost between the two stages. That progression, sample to model to printed proof to moulded production, is exactly what de-risks the spend. Send us the part or the model and we will advise the route within 24 hours.

How quickly can you quote a part?

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An engineer prices your plastic injection moulding within 24 hours, and it is a real engineer who reviews it, not an automated estimate. Our engineers review the part, the polymer, the wall sections, the tooling needed and the volume, because all of those drive the cost of a moulded part far more than the outline size does. A part with thick sections, tight detail or a demanding polymer takes more planning than a simple housing, and the quote reflects that honestly. If a 3D printed part or another route suits your volume better, you get told straight. Send a sample, a 2D drawing or a CAD file, or the worn part itself, and you will have a costed answer inside a day.

What polymers can you mould?

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We work a range of moulding polymers, from ABS, polypropylene, polycarbonate and nylon through to glass-filled and higher-performance grades, chosen for what the part has to do rather than for what is cheapest to run. The right choice is rarely obvious. A moulding polymer is selected for its stiffness or flexibility, its resistance to wear, heat, chemicals or moisture, and how cleanly it fills the tool and holds detail as it cools. Duty drives it, because a housing, a guard, a guide or a wear part in food machinery or oil and gas each pull the choice a different way, and food contact adds its own requirements. For that reason we recommend a material for your application and confirm the exact grade with you before the tool is cut. If you need a polymer outside our usual range, ask us.

What run sizes does injection moulding suit?

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Injection moulding suits parts you need in real volume, generally quantities over about 500 to 1,000, because the tool is an up-front cost that only pays back across many identical parts. Once the tool exists, each cycle produces the same part cheaply, so the more parts you run, the lower the unit cost falls. For short and medium runs of a polymer component, that makes moulding the efficient route, and it is where much of our injection moulded work for OEM assemblies sits. For a one-off or a handful of parts, we will often point you to 3D printing instead, so you are not paying to cut a tool a small quantity cannot justify. Prove the part as a print, then move the same model to a mould when the numbers grow. Send the part and the quantity and we will advise the route within 24 hours.

Why are draft angles important on a moulded plastic part?

Draft helps a moulded part release from the tool. Its practical value depends on the geometry, surface texture and material. We review draft alongside functional interfaces so release requirements are considered before tooling, rather than becoming an avoidable problem during sampling.

How do ribs and wall thickness affect a plastic moulding?

Large changes in wall thickness can affect cooling, shrinkage and the visible surface. Ribs can provide support, but they also need to be designed for moulding. We review the part as a whole and discuss changes that balance stiffness, appearance and practical production.

Can a moulded component include metal inserts?

Inserts may be appropriate for threads, electrical contacts or reinforced interfaces, depending on the design. Their suitability and installation route need to be reviewed with the tool and material. Supply the mating-part and load requirements so the complete assembly is considered.

How are moulded samples checked before a production run?

Sample approval should cover the dimensions, appearance and functional requirements agreed for the job. Some checks need the mating components or an assembly trial. We define the acceptance criteria before production and agree how any necessary changes will be reviewed.

Moulded polymer enclosure with reinforcing ribs, fixing bosses and a gasket channel

Have questions? We’re here to help.

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