The eternal dance between value and price can sometimes be mistaken for war. Well, it’s not. Especially not in cheap injection molding. Costs can drop without bringing down quality.
Cheapness and efficiency can co-exist in the same shot, in the same product, and in the same assembly. It starts by paying attention to the key cost-drivers in injection molding and finding asymmetric pathways to achieve the same goals. Keep reading.
How Can Plastic Injection Molding Be Made Affordable?
First principles. The foundational cost drivers in injection molding are part complexity, cycle time, and material choices. Cheap injection molding suppliers focus on adjusting these 3 factors without losing control over product quality.
If you want to predict how part complexity affects your injection molding bill, look at your tooling costs. The simpler the part of the design, the lower the tooling costs will be.
When you look at your individual per-part costs, they are a direct indicator of cycle time. This is the total time it takes between injection and ejection. The shorter the cycle time, the cheaper the per-unit costs.
Finally, material costs count just as much. Any given part can be made from expensive engineering-grade resins or affordable high-performing standard resins. It’s a matter of making strategic compromises.
Once you understand these factors, you can identify the best paths to cost-efficiency without sacrificing quality. A few examples include:
- Redesigning the part to remove complex features and undercuts
- Using multi-cavity molds to produce more parts in less time
- Using commodity resins that you can alternatively strengthen with fillers
- Shortening cooling times by using copper inserts
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What Are Cheap Injection Molding Materials?
Earlier, we mentioned how material costs play an important role in the final invoice you receive for injection molding.
That’s why top-rated cheap injection molding engineers don’t rush to suggest the most expensive resins. They study your product and its applications and application environment.
Then they provide affordable material options that can achieve the same outcomes as engineering resins without compromising performance
See the following examples:
| Product | Required Properties | Cheap Resins With Acceptable Outcomes | Cost ($/kg) | Expensive Materials Options | Cost ($/kg) | Money Saved ($/kg) |
| Living hinges, food containers, and car trim | Chemical resistance, high fatigue life, low density | PP (Polypropylene) | $1.30 – $1.80 | Nylon / ABS | $3.00 – $6.00 | $1.7 – $4.2 |
| Bottles, flexible lids, fuel tanks | High impact, flexibility, moisture barrier, low friction | HDPE/LDPE | $1.50 – $2.00 | Rubber / Metal | $3.00 – $8.00 | $1.5 – $6 |
| Beverage bottles, clear packaging | High tensile strength, clarity, CO2/Oxygen barrier | PET | $1.40 – $1.90 | Glass / PBT | $3.50 – $5.00 | $1.6 – $3.1 |
| Model kits, TV housings, yogurt cups | Dimensional stability, longevity, heat resistance | PS / HIPS | $1.70 – $2.20 | ABS / Acrylic | $2.50 – $5.00 | $0.8 – $2.8 |
| LEGO, power tools, electronics cases | High impact strength, scratch resistance, high gloss | ABS | $2.50 – $4.00 | Polycarbonate (PC) | $3.50 – $5.50 | $1 – $1.5 |
Are There Cheaper Alternatives to Injection Molding?
To a business owner who needs only 50 parts, injection molding is an expensive endeavor. Don’t try it. Save your money by choosing 3D printing.
But if you aim to manufacture thousands of parts now or in the future, injection molding is a wise investment.
In injection molding, the math gets better with time and volume because of mold amortization. By your 100,000th product, per-part costs can be pennies, giving you huge profit margins.
How Is Quality Maintained in Cheap Injection Molding?
The biggest misconception out there is the belief that cheap equals junk. Outcomes change when there are adequate DFM review practices and process control strategies in place. Costs reduce and quality increases.
Scientific process control
One strategy that is consistently reliable is scientific process control. It follows rigorous DFM reviews that optimize design. Once molding begins, the process is handed over to data-controlled automation.
Using sensors, molding machines auto-adjust temperature, pressure, and cooling to achieve optimal product outcomes fast and cheaply. Beyond cutting cycle time, this approach reduces labor costs and eliminates the risk of failure.
Conformal cooling
Conformal cooling is another easily implementable strategy in injection molding cost management and quality optimization.
Inside the mold, pre-installed cooling channels are designed to follow the part’s shape in a way that maximizes heat dissipation. This reduces the length of cooling time needed and, most importantly, ensures that the part doesn’t shrink unevenly as it cools.
Regrind management
Material recycling is a core part of cheap injection molding. Waste materials are cleaned, dried, and reused in the injection molding process. However, this process must be done carefully using an optimal regrind-to-virgin-resins ratio.
Mixing a strict 10-20% of recycled resins into virgin resins can reduce materials costs without impacting output product quality. Using dust separators that remove dust particles from the waste resin before reusing is highly encouraged.
Who Benefits from Cheap Injection Molding Services?
Startups are the most in need of cheap injection molding services. Strategic cost optimization strategies can help entrepreneurs prove product or market viability before they run out of runway.
In unpredictable financial climates, consumer goods companies should leverage cheap injection molding and pass the cost-savings down to consumers. This can help relieve the household financial pressure from inflation or high tariffs.
Similarly, industrial component manufacturers should make the most of cheap injection molding. Here, function trumps aesthetics as most parts are hidden inside a machine. Materials don’t need to deliver high grade finish, for example. They just need to be durable.
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Conclusion
The future of injection molding is cheap and high-quality. That has been the evolution path of technology on the planet for centuries, so why wait? You can start now by using cost-cutting strategies that revolve around design, resins, and cycle time optimization. Cheap injection molding will get better as the years progress, but it can still save you a ton of money as it stands today.
FAQs
No, we don’t have a minimum order quantity. Whether you need a small batch or large-scale production, we’re happy to accommodate your needs!
Yes, we offer sample production for all our products. This allows you to review and approve the quality before proceeding with the full order.
If you need to make any changes to your order, just let us know as soon as possible. We are flexible
