Custom Injection Molding, Made to Fit Your Part
We build the mold and mold the parts in one factory, to IATF 16949:2016 quality. A quick aluminum mold in 2 to 3 weeks, or a hard steel mold that runs over a million parts.
- 50+ resins: ABS, PP, PE, PC, Nylon, POM, PEEK, TPU.
- Standard tolerance 0.05 mm, tighter on key features.
- DFM review and quote back in under 24 hours.
What Is Custom Injection Molding?
Last updated: August 2026
Custom injection molding means building a mold shaped like your part, then pushing melted plastic into it to make the same part again and again. You pay for one tool, then get thousands or millions of matching parts.
Meco runs five plastic processes under one roof: injection molding, extrusion, blow molding, thermoforming, and 3D printing. A molding-only supplier will always quote you a mold. We tell you when a different process is cheaper.
We cut our own molds with CNC machining and heat treatment, then add plating, painting, and other finishes and full assembly. New to this? Read what plastic injection molding is, or see how contract manufacturing lowers your landed cost.
Tolerance
0.05 mm
Standard on molded features. Tighter on key features by design.
Tooling Time
2 to 8 weeks
Aluminum 2 to 3 weeks. Steel 4 to 8 weeks.
Order Size
10 to 10M+
No MOQ. One sample or a full production year.
Quality Standard
IATF 16949
The automotive quality system, applied to every plastic part.
Swipe for all four
Five Ways to Make Plastic Parts, All in One Place
Each process suits a different shape, size, and volume. We pick the one that fits your part, not the one we happen to own.
Plastic Injection Molding
Melted plastic forced into a steel or aluminum mold. Housings, gears, clips. Insert and two-shot supported, at 0.05 mm standard tolerance.
See injection molding →
Plastic Extrusion
Plastic pushed through a shaped die and cut to length. Tubes, seals, and channels in PVC, PP, PE, PC, and PA.
See plastic extrusion →
Blow Molding
Air inflates hot plastic inside a mold. Bottles, tanks, and ducts with even walls and leak testing. See how blow molding works.
See blow molding →
Thermoformed Blister
A heated sheet pressed over a tool. Trays, clamshells, and blisters, with anti-static options for electronics.
See thermoforming →
Plastic 3D Printing
Built layer by layer with no mold needed. The fastest route to a first part, in ABS, TPU, PEEK, PC, PLA, and Nylon.
See 3D printing →Not Sure Which Process Fits?
Send the part. Our engineers pick the process, resin, and finish against your volume and geometry, then price it.
Ask Our EngineersSwipe for all five processes
Which Process Should You Use?
A side-by-side view of the five plastic processes. For the two most often confused, read our injection molding vs thermoforming guide.
| Process | Volume | Tooling Cost | Part Shape | Tolerance | Typical Parts |
|---|---|---|---|---|---|
| Injection Molding | High | High | Solid, complex | 0.05 mm | Housings, gears, connectors |
| Plastic Extrusion | High | Medium | Long, constant | 0.1 mm | Seals, channels, tubing |
| Blow Molding | Medium to high | Medium | Hollow | 0.5 mm | Bottles, tanks, ducts |
| Thermoforming | Low to high | Low | Shallow, tray-like | 0.3 mm | Trays, blisters, clamshells |
| 3D Printing | 1 to 50 | None | Any | 0.13 mm | Prototypes, fixtures |
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Why OEMs Pick Meco for Custom Molding
We own the factories, cut the molds, mold the parts, finish them, and assemble them. One supplier, one purchase order, one engineer on your program.
Five Processes, One Roof
Injection, extrusion, blow, thermoforming, and 3D printing in one place. If your part is wrong for molding, we say so before you pay for a tool.
We Build Our Own Molds
Molds designed and cut in house with CNC machining. Aluminum in 2 to 3 weeks, steel in 4 to 8 weeks.
DFM Before Steel Is Cut
We review draft, wall thickness, gates, and resin with every quote. Changes at this stage typically cut cost 15 to 30%. How to pick a molder.
Molding to Finished Product
Plating, painting, pad printing, then full product assembly and global warehousing. See whole product manufacturing.
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What We Check in Your Design
Most molding problems are designed in, not made in. These are the first things our engineers look at when your file arrives, and the fixes that save the most money.
| What We Check | What Good Looks Like |
|---|---|
| Wall Thickness | Even walls, roughly 1 to 3 mm for ABS, PP, PC, and Nylon. Thick spots cause sink marks and long cycles. |
| Draft Angle | 1 to 2 degrees on plain walls, 3 degrees or more on textured walls, so the part releases cleanly. |
| Ribs and Bosses | Ribs about 60% of the wall thickness, with a radius at the base. Stops sink marks on the show face. |
| Gate Position | Placed where the witness mark will not be seen and the flow fills evenly. Moved before the tool is cut, not after. |
| Resin Choice | Matched to load, heat, chemicals, and UV. A resin swap is often the cheapest fix in the whole program. |
| Tolerances | 0.05 mm standard. Tight callouts kept only where the part needs them, since each one adds tool cost. |
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General design guidance. Your part gets specific numbers back with your quote, in under 24 hours.
Industries We Mold Plastic Parts For
From automotive interior trim to medical device enclosures. Resin, process, and tolerance chosen per industry.
Automotive Parts
Interior trim, dashboard parts, connector housings, and under-hood components in PA6, PBT, and PC-ABS. We can mold metal threads into a housing, or add a soft TPU grip over hard plastic in one part. See our automotive parts manufacturing.
Medical Equipment
Equipment enclosures, instrument grips, IV components, and trays that survive repeated hospital cleaning, molded in PC, PEEK, and TPU. Full lot traceability and first article inspection on every program. See our medical equipment manufacturing.
Consumer Electronics
Device enclosures, button caps, and battery doors, with gloss, matte, or textured surfaces straight from the tool. Add chrome plating, PVD, or paint, then PCB assembly and box build. See our electronics manufacturing.
Home Appliances
Fridge bins, control panels, knobs, and water tanks in PP, ABS, and PC-ABS. Large hollow parts such as detergent tanks and air ducts go to blow molding instead of a big injection tool. See our home appliance manufacturing.
Aerospace Parts
Cabin trim, duct clips, instrument covers, and anti-static trays in heat-resistant PEEK and PEI. Serial traceability, FAIR, and material certificates come with the parts. See our aerospace parts manufacturing.
Industrial Manufacturing
Plastic gears, bushings, valve handles, and machine guards in POM and Nylon. Glass fibre reinforcement adds stiffness for load-bearing parts. Read our guide to industrial manufacturing, or see the full list of Meco capabilities.
Telecom
Connector housings, cable management, splice trays, and outdoor enclosure parts in flame-retardant PC, PBT, and PC-ABS. UV-stabilised grades for parts that live outside. See our telecom manufacturing.
Lighting
Lenses, diffusers, reflector housings, and trim in optical-grade PC and PMMA. The tool finish gives clear, frosted, or textured surfaces with no secondary polishing. See our lighting manufacturing.
Heavy Equipment
Operator grips, knobs, fluid tanks, and guards in Nylon and TPU that resist abrasion and cracking. Large hollow parts such as fluid tanks go to blow molding. See our heavy equipment manufacturing.
Commercial Furniture
Chair shells, armrests, cable grommets, and adjustment knobs in PP and ABS, with soft TPU overmolding where a grip needs to feel good. See our commercial furniture manufacturing.
Resins We Mold
Over 50 resins across the five processes, including glass-filled and flame-retardant grades. Need a metal part with molded-in detail instead? See metal injection molding.
| Process | Resins Available |
|---|---|
| Injection Molding | ABS, PP, PE, PC, PC-ABS, PA (Nylon), POM, TPU, TPV, TPE, PBT, PEEK, plus glass-filled grades |
| Plastic Extrusion | PVC, PP, PE, PC, PA |
| Blow Molding | PVC, PP, PE, PET |
| Thermoforming | PVC, PP, PE, PET |
| 3D Printing (FDM) | ABS, TPU, PEEK, PC, PLA, PA (Nylon) |
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Ready to Price Your Molded Part?
Send a STEP file. You get tooling cost, part cost, and DFM notes back in under 24 hours. NDAs signed as standard.
Custom Injection Molding FAQs
What is custom injection molding?
Custom injection molding is making plastic parts from a mold built for your design only. Melted plastic is injected into the mold under pressure, cooled, and ejected as a finished part. One mold then produces thousands or millions of identical parts, which is why the cost per part drops sharply as volume rises.
How much does an injection mold cost?
An aluminum test mold runs $2,000 to $8,000. A soft steel mold for medium volumes runs $8,000 to $25,000. A hard steel production mold runs $20,000 to $80,000 or more. Price tracks part size, number of cavities, and features like slides and lifters. Hard steel molds run over a million shots.
How much does each molded part cost?
Small parts in commodity resins such as PP and ABS run 10 cents to $1 each. Larger or more complex parts in PC or Nylon run 50 cents to $5. Engineering resins such as PEEK or glass-filled grades run $3 to $30 or more. Volume is the biggest lever, since the tool cost spreads across every part.
How long does injection molding take?
Aluminum tooling takes 2 to 3 weeks and steel tooling takes 4 to 8 weeks. After you approve first samples, production parts ship in days to weeks depending on quantity. Your quote and DFM feedback come back in under 24 hours.
What tolerance can injection molding hold?
Our standard is 0.05 mm on molded features. Tighter tolerances are achievable on key features through cavity design, gate placement, and cooling control, and we call these out during DFM. More detail in our plastic injection molding guide.
Can you do overmolding and two-shot molding?
Yes. We support insert molding, where metal parts are molded into the plastic, and two-shot molding, where two resins bond into one part, such as soft TPU on a hard PC body. Learn more in our 2K molding guide.
What is your minimum order quantity?
There is no MOQ. With aluminum tooling, 100 to 500 parts works well for pilot builds and market tests. Injection molding usually beats other processes on cost from roughly 1,000 to 5,000 parts a year. Below that, 3D printing is often the better call and we will tell you so.
What certifications and protections do you have?
Meco is IATF 16949:2016 certified, the automotive quality standard, which is built on all ISO 9001:2015 requirements. We run APQP, PPAP, SPC, and PFMEA, and supply REACH and RoHS documentation. Your design stays yours: we provide IP protection and sign NDAs before work starts. Production is in Thailand and China, managed from Canada. More about Meco.
How to Get Started
Upload a STEP or IGES file with your resin, volume, and finish notes through the quote form. NDA first if you prefer.
We confirm the best process of the five, flag design risks, recommend a resin, and price both tooling and parts. New to sourcing? See how to find a manufacturer.
We cut the mold in house, run samples, and ship them with inspection reports for your sign-off.
Full production with SPC and documentation, then finishing, assembly, and global warehousing. Scale from 100 parts to 10 million with the same partner.
Learn More About Plastic Molding
Guides written by our engineering team on process choice, tooling, and cost.
What Is Plastic Injection Molding?
How the process works, which resins to pick, design rules, mold types, and what it costs.
Read the guide →What Is 2K (Two-Shot) Molding?
Two-shot, overmolding, and multi-resin parts: when they pay off and how to design them.
Read the guide →Injection Molding vs Thermoforming
Tooling cost, volume break points, tolerance, and a clear rule for choosing between them.
Read the guide →Swipe for all three guides
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