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Think injection molding is expensive? Think again. Although the initial tooling investment may seem significant, injection molding becomes highly cost-effective for medium- and high-volume production. Efficient mold design, automated processes, minimal material waste, and fast cycle times help reduce manufacturing expenses, while economies of scale lower the cost per part as production increases. In addition to affordability, injection molding delivers consistent quality, precise dimensions, repeatable results, and reliable performance across large production runs. For businesses seeking a practical way to manufacture durable, high-quality components quickly and efficiently, injection molding can offer excellent long-term value.
Many people assume injection molding is only suitable for large manufacturers with large budgets. I had the same concern when I first compared molding with 3D printing and CNC machining. The mold cost looked high, so the process seemed out of reach.
The full picture is different. Injection molding can become a practical choice when the part design, material, order volume, and mold structure match the project. The key is to review the total cost instead of focusing on the mold price alone.
A molding project usually includes four main costs:
The mold often receives the most attention because it is paid before production begins. A simple single-cavity mold may cost less than a complex mold with multiple cavities, sliders, lifters, or hot runner systems. Part size also affects the price. A small enclosure with a simple shape needs a different mold structure from a large automotive panel.
Material selection also changes the budget. Common materials such as PP, ABS, and PE are often easier to source and process. Engineering plastics may cost more, especially when the part needs heat resistance, chemical resistance, or higher strength. I usually ask whether the material property is needed for the product or simply selected by habit. This question can remove an unnecessary cost without changing the main function.
Order quantity has a strong effect on unit price. Suppose a mold costs $6,000 and produces 100 parts. The mold cost adds $60 to each part before material and production costs are counted. If the same mold produces 10,000 parts, the mold cost adds only $0.60 per part.
That does not mean a large order is always required. A small production run may still make sense when the part is used for repeated sales, replacement products, or a long-term project. I compare the expected total demand with the cost of other production methods before selecting the process.
Part design can also reduce molding costs. Sharp inside corners, uneven wall thickness, deep undercuts, and very thin sections may require extra mold features. These features can increase both mold construction and maintenance costs.
A few design changes often help:
I once reviewed a small plastic housing design with a deep side hook. The hook required a sliding section in the mold. The designer changed the hook into a two-piece snap-fit structure, and the mold layout became simpler. The product still served the same purpose, while the mold estimate became easier to manage. This type of change should be checked by an engineer because a lower mold price is not useful if the part loses strength.
Production planning matters as well. A mold with one cavity may suit a small order. A mold with four or eight cavities can produce more parts per machine cycle, but it usually requires a higher starting cost. Choosing more cavities before confirming demand may place pressure on the project budget.
Before requesting a quote, I prepare a clear file package:
A supplier can give a more useful estimate when the information is complete. If the design is still changing, I ask for a design review before mold production. A small correction in CAD may be easier than a mold change after steel has been cut.
I also compare the full production cost, not just the tooling quote. A lower mold price may come with higher part waste, slower cycles, limited maintenance support, or weaker control over dimensions. A higher quote may include better steel, clearer inspection steps, and a mold structure suited to the expected production volume.
Injection molding is not automatically cheaper for every project. For a few sample parts, 3D printing or CNC machining may be more suitable. For repeated plastic parts, molding can lower the unit cost once the tooling expense is spread across the order. The right choice depends on quantity, design, material, tolerance, and product use.
My practical approach is simple: define the part function, confirm the expected quantity, simplify the geometry where possible, select the material based on actual needs, and ask for a full cost breakdown. When these points are reviewed together, injection molding may fit a budget that first appeared too small.
Many buyers assume lower-cost injection molding means thinner walls, rough surfaces, weak parts, or missed delivery targets. That concern is reasonable. A lower quote can hide poor mold design, unstable material choices, extra finishing work, or repeated production defects.
I look at affordable injection molding in a different way. Cost control should come from better planning, practical part design, suitable materials, and a production process that avoids waste. The goal is not to remove every cost. The goal is to spend money where it supports part function and reduce spending that does not improve the result.
I begin by asking a simple question:
What must the part do?
A protective cover may need impact resistance and a clean appearance. An internal bracket may need stiffness, but its surface may not need a polished finish. A food-contact component may require a material that meets the required safety standard. Each use case changes the mold, resin, inspection plan, and production cost.
A clear part brief should include:
A part that only needs to hold two wires should not be designed like a load-bearing component. Matching the design to the actual job can reduce material use and mold complexity without weakening the finished product.
Mold cost is often affected by decisions made in the CAD file. Small changes at this stage can prevent larger costs later.
I review several points before tooling starts:
Uneven wall thickness can lead to sink marks, warping, and longer cooling cycles. A draft angle may add little to the part price while reducing the chance of ejection damage. These are small design choices, yet they can affect both quality and production cost.
I do not treat design for manufacturing as a way to change the customer’s product without approval. I use it to show where a small adjustment may reduce risk.
Resin price is only one part of the material decision. The material must also match the product’s working conditions.
Common choices may include:
Material grades can vary within the same resin family. A lower-cost grade may work for a simple indoor cover, while a more suitable grade may be needed for heat, chemicals, or repeated stress.
I also check whether the project needs virgin resin, approved recycled content, color masterbatch, flame resistance, or other additives. Using a material only because it costs less can create higher costs through rejects and field failures.
A mold does not need every available feature. It needs the features that support the required part quality and production volume.
For a short production run, a single-cavity mold may be a practical choice. A multi-cavity mold can reduce the cycle cost per part when the order volume supports the higher tool investment. The right choice depends on annual demand, part size, cycle time, machine capacity, and acceptable unit cost.
I also compare:
A simpler mold can produce a reliable part when the geometry is simple and the volume is moderate. A more complex mold may be justified for higher output or tighter process control. The quote should explain what each option includes.
Affordable production still needs a quality plan. A lower price has little value if many parts require sorting or rework.
A practical inspection plan can include:
Not every dimension needs the same inspection frequency. I separate critical features from cosmetic or low-risk features. This keeps the inspection process focused without creating unnecessary labor.
For example, a snap-fit feature may need closer measurement than a hidden inner wall. A visible front panel may need more surface inspection than an internal support rib.
A molded sample gives more useful information than a quotation alone. It can show whether the part fits, whether the texture looks right, and whether the mold creates marks in the wrong location.
A small appliance enclosure is a practical example. The first design may show a sink mark near a screw boss. The issue may come from a thick section rather than poor machine control. A design adjustment, such as reducing the boss wall thickness or adding a support feature, may solve the issue before full production. That change can cost less than sorting a large batch of unsuitable parts.
I prefer to review sample results with clear records:
This record helps prevent different teams from working from different instructions.
A useful quotation should separate the main cost items:
This makes it easier to see where savings may be possible. Changing the packaging may reduce logistics cost. Removing an unused surface finish may reduce mold work. Adjusting the order quantity may change the unit price, but it should match actual demand.
I avoid cost reductions that affect safety, fit, required performance, or agreed inspection standards. Saving on these areas may create repair, replacement, or customer service costs later.
Before placing an order, I ask the supplier:
Clear answers do not remove every production risk. They make the risk easier to manage.
Affordable injection molding works best when the product design, mold plan, material choice, and inspection method support each other. I do not try to make every part as cheap as possible. I aim for a reasonable balance between function, appearance, production volume, and long-term use.
A lower-cost part can still meet its required standard when savings come from better decisions rather than skipped controls.
Many manufacturers look at the hourly machine rate when they compare injection molding suppliers. That number matters, but it does not show the full cost.
Material waste, mold changes, rejected parts, unplanned maintenance, long cycle times, and manual inspection can add more cost than the machine itself. I have seen a low hourly quote become an expensive production plan after these items were included.
Smart injection molding helps me control those hidden costs through better data, process control, and production planning.
1. I start with the full part cost
A useful cost review includes:
A part that costs $0.42 at the machine may reach $0.58 after scrap, extra handling, and inspection are added. Looking at the full production cost gives me a better basis for decisions.
This approach also helps me compare different mold designs. A mold with a higher purchase price may reduce cycle time or scrap enough to lower the cost per part.
2. Process monitoring reduces rejected parts
Injection molding depends on several process conditions:
Small changes can create flash, short shots, sink marks, warping, or color variation. When operators only check a few parts by hand, the problem may continue for several hours before anyone notices it.
A smart molding setup records process data during each cycle. The production team can compare current readings with approved process limits. A change in pressure or fill time can be reviewed before it creates a large batch of defective parts.
For example, a production run of 100,000 parts with an 8% scrap rate produces 8,000 rejected parts. If process monitoring helps reduce scrap to 3%, the plant avoids about 5,000 rejected parts. The actual saving depends on resin price, labor, machine time, and rework cost, but the calculation shows where the value comes from.
The goal is not to collect data for its own sake. The data needs to support a clear action, such as checking the mold vent, adjusting cooling, or inspecting the material dryer.
3. Stable cycle times improve machine output
A long cycle does not always mean a better part. Extra cooling time may reduce warping, yet it also limits the number of parts a machine can produce during a shift.
I review each stage of the cycle:
If cooling takes 18 seconds and the part reaches its required shape after 14 seconds, the extra four seconds may be worth reviewing. A mold flow study, temperature check, or part inspection can help confirm whether the cycle can be adjusted safely.
A small reduction has a direct effect. A 30-second cycle produces about 120 cycles per hour. A 27-second cycle produces about 133 cycles per hour. The result is not automatic, because machine limits and quality requirements still apply, but the plant may produce more parts with the same equipment.
I avoid cutting cycle time without testing. A faster cycle that creates warping or weak weld lines can raise the total cost.
4. Better mold design lowers production waste
The mold controls much of the production result. Gate location, runner design, venting, cooling channels, ejection, and part thickness all affect quality and cost.
A poorly placed gate can cause visible marks or uneven filling. Weak venting can trap air and create burn marks. Uneven cooling can cause distortion. These problems may lead to extra sorting or a rejected batch.
During design review, I ask:
Hot runner systems may reduce runner waste for some products. Cold runner systems may be a better fit for other projects because of lower tooling cost and easier maintenance. The right choice depends on part volume, resin, geometry, quality needs, and service plans.
There is no single mold design that suits every product.
5. Material control prevents avoidable loss
Resin must be stored, dried, mixed, and handled according to its supplier guidance. Moisture-sensitive materials can create bubbles, weak areas, silver streaks, and surface defects when drying conditions are not controlled.
Material tracking also helps prevent mix-ups. I record:
Regrind can lower material cost when the part specification allows it. It should not be added at a level that changes strength, appearance, or dimensional performance.
A simple material record can explain why a batch behaves differently from the approved sample. Without that record, the team may change machine settings when the real issue is material moisture or an incorrect blend.
6. Predictive maintenance reduces unplanned downtime
A mold or machine failure can stop production, delay delivery, and create repair costs. Preventive maintenance helps, but a fixed calendar does not always match actual equipment use.
I prefer maintenance plans that consider:
For example, a mold may require cleaning after a certain number of shots, while another mold used with a corrosive material may need attention sooner. Shot-based records provide a more useful guide than a general monthly reminder.
Maintenance also affects part quality. A worn check ring can cause unstable shot size. Blocked cooling channels can extend cycle time. Damaged vents can create burns and short shots.
Repairing these issues during planned maintenance is often easier to manage than stopping a production run after a failure.
7. Automation should solve a clear problem
Automation can reduce handling time, improve repeatability, and protect workers from hot parts. It does not always lower cost by itself.
Before adding a robot or vision system, I measure the current task:
A pick-and-place robot may suit a high-volume part with a steady cycle. A simple conveyor or counting system may be enough for another product. Vision inspection can help check key features, but it should be tested against the actual defect types.
The payback should include equipment cost, integration, programming, service, training, and downtime during installation.
8. I use a small production test before changing the full process
A controlled trial helps me separate a useful improvement from a risky guess.
My review usually follows this order:
Changing several settings at once makes the result difficult to understand. One adjustment may improve the surface while another creates a dimensional issue.
A production sheet should show the approved values, acceptable ranges, material details, mold number, machine number, and inspection results. This gives each shift the same reference point.
A practical cost example
Imagine a 20-gram part made from resin priced at $2 per kilogram. A run of 100,000 parts requires about 2,000 kilograms of resin before process losses.
At an 8% scrap rate, about 8,000 parts are rejected. If the plant reduces scrap to 3%, about 5,000 additional parts meet the quality requirement. The resin saving alone may be modest, but the wider saving can include:
The numbers should be confirmed with plant records. A calculation like this is a planning tool, not a promise of savings for every project.
Smart injection molding does not mean buying the most software or adding the most automation. It means using suitable tools to control the costs that affect the finished part.
I focus on stable processes, accurate material handling, practical mold design, planned maintenance, and measured trials. When each change is linked to scrap, cycle time, downtime, or labor, the production team can see whether the investment is helping.
The most useful question is not, “How can I make the machine run faster?”
It is, “How can I produce more accepted parts with less waste and fewer interruptions?”
Many buyers see the price of an injection mold and assume the whole process is too expensive. I understand the concern. A mold may require a large payment before the first finished part leaves the machine, and that upfront cost can feel hard to justify.
The full picture depends on more than the mold price. Part design, material, production volume, surface finish, tolerances, and mold life all affect the final cost.
A simple comparison helps.
A 3D-printed prototype may cost only a few dollars per piece. A low-volume CNC part can also be practical for early testing. Injection molding usually needs a custom tool, so the starting cost is higher. Once the mold is ready, each molded part may take only a short time to produce, with less manual work per unit.
That changes the cost pattern:
A common example is a small plastic enclosure. Suppose a company needs 100 pieces for a market test. A custom mold may not make financial sense at that stage. The company could use 3D printing or CNC machining to check the fit, assembly, and user response.
If the same enclosure will need 20,000 or 100,000 pieces, the calculation changes. A mold cost is spread across many parts. The unit price can become more predictable, and the production cycle can be easier to manage.
The mold design has a strong effect on the budget.
A basic single-cavity mold with a simple part shape may be suitable for a small production run. A multi-cavity mold can produce several parts per cycle, though it usually requires more design work and a higher starting cost. Slides, lifters, threaded features, tight tolerances, polished surfaces, and special texture patterns can add machining time.
I usually ask these questions before judging a quotation:
These questions often reveal where the cost comes from.
Part design can reduce or increase mold complexity. Uniform wall thickness helps control cooling and may reduce problems such as sink marks or warpage. Draft angles help the part release from the mold. Rounded corners can support smoother material flow and reduce sharp machining details.
A design that looks simple from the outside may still need a complex mold if it includes undercuts, side holes, or internal locking features. I prefer to review these details before the mold quotation is accepted. Small changes at the design stage may prevent larger changes after tool construction begins.
Material choice matters as well.
Common materials such as polypropylene, ABS, and polyethylene are used for many products. Engineering plastics may be selected for heat resistance, strength, chemical exposure, or dimensional needs. Some materials need controlled drying before molding, and some require special processing conditions. These requirements can affect production cost and cycle time.
Color can affect the process too. A standard color may be easier to manage than a custom color that needs approval and repeated sampling. A molded-in texture may hide minor marks better than a high-gloss surface, which can require more mold polishing and closer visual inspection.
The most useful way to compare costs is to look at the total project cost instead of only the mold price.
A simple estimate can include:
A low mold quotation may not be the lowest total cost if it leads to repeated repairs, unstable dimensions, or slow production. A higher quotation may include better steel, stronger mold components, clearer inspection steps, or more support during sampling. The quotation should show what is included so the numbers can be compared fairly.
I also recommend requesting a design review before production. The review can cover wall thickness, draft, parting lines, gate location, ejection marks, tolerances, and expected shrinkage. A short technical discussion at this stage can make the later process easier to control.
Injection molding is not always the right answer. For prototypes, custom parts, small batches, or products that may change often, 3D printing, CNC machining, vacuum casting, or other methods may fit better. For stable designs with repeated demand, molding may offer a more suitable cost structure.
The key question is not “Is injection molding expensive?” A better question is “Does the expected production volume support the tooling and process?”
When I compare manufacturing options, I look at the complete product plan: design maturity, expected quantity, part requirements, timeline, and future changes. That approach gives a clearer view than judging the mold price alone.
When I review a product with high production costs, I often find the same problems: too much material, a mold design that takes too long to build, low order volume, or a part shape that makes each cycle slower than it needs to be.
Injection molding can lower the cost per part, but the savings do not come from the molding machine alone. I need to control the full process, from product design and mold planning to material selection, production volume, and quality checks.
A clear cost plan helps me avoid paying for changes after the mold is complete.
Start with the part design
A part that looks simple may still be expensive to mold. Deep cavities, sharp corners, uneven wall thickness, and difficult ejection points can raise tooling and production costs.
I review these design details before requesting a mold quote:
A small change in the CAD model can reduce machining work and shorten the molding cycle. It can also lower the risk of warping, sink marks, and incomplete filling.
Choose the right mold structure
The mold is often the largest early expense. A complex mold may support more functions, but it can also require extra slides, lifters, inserts, and maintenance.
I usually compare the product requirements with the simplest mold structure that can meet them.
A single-cavity mold may fit a low-volume project. A multi-cavity mold may suit a product with steady demand because it produces several parts during each cycle. The best option depends on the expected order quantity, target price, part size, and required quality.
A mold with replaceable inserts can also help control future repair costs. If one area wears out, I may replace the insert instead of rebuilding the full mold.
For a new product, I prefer a mold plan that supports the current project without adding features that have no clear use.
Select material by function
Material cost affects the unit price, but the lowest-priced resin is not always the right choice. A material that fails during use can create returns, rework, and replacement costs.
I match the resin to the product needs:
Color, additives, glass fiber, flame resistance, and UV resistance can change the material price. I ask whether each feature is required by the product or only requested for appearance.
A clear material specification prevents the supplier from making assumptions and helps me compare quotes more fairly.
Control the molding cycle
Production cost is closely linked to cycle time. A cycle that takes 45 seconds may produce fewer parts per hour than a cycle that takes 25 seconds. Cooling often takes a large share of the cycle, so mold cooling design deserves careful attention.
I check:
The settings must protect part quality. Cutting cooling time without testing may cause deformation or dimensional problems. A stable process is more useful than a short cycle with a high rejection rate.
A supplier can use sample runs to compare cycle settings. I review the part dimensions and surface condition before approving a production rate.
Plan the order quantity with care
Injection molding usually requires an upfront mold investment. A larger order can spread that cost across more parts, but storing too many finished products creates another expense.
I estimate:
A company that needs 10,000 parts per year may choose a different mold plan from a company that needs 100,000 parts per month. There is no useful volume target without looking at the product’s sales pattern.
For a new product, I may use a simpler mold for early validation. After demand becomes more predictable, a larger cavity count or automated process may make sense.
Reduce secondary operations
Every extra process adds labor, equipment use, handling, and inspection time. Painting, drilling, trimming, assembly, and labeling can raise the total cost after molding.
I look for ways to build required features into the molded part:
Part consolidation can reduce assembly work, yet it may create a larger mold or make repairs harder. I compare the full production cost rather than focusing on one operation.
Ask for a complete quote
A low unit price does not always represent a low production cost. I ask suppliers to show the main cost items separately:
This format helps me see where the cost comes from. It also makes supplier comparisons more useful.
For example, Supplier A may offer a lower part price but charge more for the mold and packaging. Supplier B may quote a higher part price but include better inspection and a mold structure that supports future repairs. The better choice depends on the full project cost.
Use a small production test
Before placing a large order, I prefer to review molded samples under normal use conditions. A sample can show issues that are not visible in a 3D model, such as flashing, short shots, sink marks, color variation, or difficult assembly.
My sample review usually covers:
A sample approval document should record the material, color, dimensions, surface requirements, and accepted defect limits. This gives both sides the same reference during production.
A practical example
Imagine I am developing a small plastic enclosure for an electronic device. The first design uses thick walls, a glossy finish, four separate screws, and a deep internal section. The mold quote is high, and assembly takes several minutes per unit.
I revise the design by making the walls more even, adding draft, using molded locating features, and replacing two screws with snap-fit points. I keep screws where they support product safety and service needs. I also choose a standard black ABS grade instead of a custom material blend.
The revised design may reduce machining work and assembly time. The exact savings depend on the supplier, order quantity, mold structure, and product requirements. Testing is still needed before approval.
Build cost control into the design stage
The most useful cost reductions usually happen before mold production begins. Once steel has been cut, design changes can create extra charges and delay the project.
I ask these questions early:
Injection molding works best when product design, mold engineering, material selection, and production planning support each other. A lower price should not come from removing features that protect safety or function. It should come from reducing waste, avoiding unnecessary complexity, and building a process that produces consistent parts.
A mold is more than a tool used to shape plastic or metal. It affects cycle time, product quality, material waste, maintenance work, and delivery plans. When I review a production line, I often find that the mold itself is not the only problem. Small issues in design, setup, cooling, or maintenance can reduce its value over time.
I use a simple approach to help each mold perform more consistently.
Before changing a mold, I look at the product, material, expected volume, and machine conditions.
A mold designed for short production runs may not suit continuous production. A mold made for one material may create defects when the material changes. The right design depends on the full production plan, not only the part drawing.
I check:
This step helps prevent a common mistake: choosing a mold based on purchase price while ignoring operating cost.
A small design change can affect every cycle.
I pay close attention to gate position, runner layout, draft angle, parting line, ejector placement, and cooling channels. These details can influence filling, warpage, ejection, and cycle time.
For example, a plastic housing with uneven wall thickness may show sink marks near the ribs. Increasing the injection pressure may hide the issue for a short period, but it can also raise stress in the part. A better solution may involve changing the rib design, adjusting the gate location, or improving cooling around the thicker area.
A useful design review asks:
These questions are easier to answer before steel is cut than after production begins.
Cooling often takes a large part of the molding cycle. Poor cooling can also lead to warpage, uneven shrinkage, and longer setup work.
I check whether the cooling channels match the shape and thickness of the part. I also look for blocked passages, leaking connectors, poor water flow, and large temperature differences between cavities.
A simple maintenance record can show useful patterns. If one cavity produces parts that cool more slowly than the others, the issue may come from water flow or channel blockage rather than the injection settings.
A manufacturer producing storage containers, for example, may notice that the parts near one side of the mold warp more often. Measuring the water temperature and flow at each circuit can reveal a cooling imbalance. Correcting that issue may reduce rejected parts without changing the whole machine setup.
Every mold needs care, even when it appears to be working well.
I suggest recording:
Maintenance should follow both calendar time and cycle count. A mold used every day may need a different schedule from a mold used once a month.
The maintenance team should also know which parts are wear components. Ejector pins, guide components, seals, slides, and shut-off areas often need regular inspection. Replacing a worn part at a planned service point can help prevent damage to larger mold sections.
A well-built mold can still produce unstable parts when setup conditions change without records.
I keep a setup sheet for each mold. It can include:
When an operator changes a setting, the reason should be recorded. This gives the next operator useful information and reduces repeated trial and error.
I also recommend checking whether the mold is running on a suitable machine. A machine with poor alignment, limited injection capacity, or unsuitable tie-bar spacing can create problems that look like mold defects.
The value of a mold can be measured through production results.
I look at:
A mold with a low purchase cost may create higher expenses if it needs frequent repair or causes many rejected parts. A mold with a higher initial cost may make sense when it reduces downtime and supports steady production. The decision should come from data that matches the production plan.
A simple spreadsheet can be enough. Record the date, mold number, machine, operator, output, rejected parts, and issue found. After several production runs, repeated problems become easier to see.
Product requirements often change after a mold enters production. A new logo, different wall thickness, updated hole position, or material change may require a mold adjustment.
I discuss these possibilities before the mold is built. Replaceable inserts, extra steel in selected areas, and accessible cooling circuits can make later changes easier. This does not mean every mold needs to support every possible change. It means the likely changes should be considered early.
A packaging company that expects several label versions may benefit from replaceable inserts. A supplier producing one fixed part for a short project may prefer a simpler structure. The right choice depends on the product life and business plan.
Good communication continues after delivery.
I share part defects, cycle data, maintenance records, and production feedback with the supplier. Clear photos and measurements help the supplier understand the issue. A statement such as “the part is not good” gives little direction. A report showing where the defect appears, when it happens, and which settings were used is much more useful.
My view is simple: a mold should be managed as part of the production system, not treated as a one-time purchase. Careful design, stable setup, regular maintenance, and basic data tracking can help the mold provide more useful output over its service life.
For any inquiries regarding the content of this article, please contact zjjusheng: info@zjjsmould.com/WhatsApp 13516880625.
John P. Beaumont, 2007, Runner and Gating Design Handbook for Injection Molding of Plastics
Douglas M. Bryce, 1996, Plastic Injection Molding Manufacturing Process Fundamentals
Malloy, Robert A., 2010, Plastic Part Design for Injection Molding
Osswald, Tim A. and Turng, Lih-Sheng, 2001, Injection Molding Handbook
Rosato, Donald V. and Rosato, Marlene G., 2000, Injection Molding Handbook
Kazmer, David O., 2016, Injection Mold Design Engineering
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