Cost Structure & Sourcing Guide: Injection Molding & Custom Products & Product Sourcing
At FMS, we leverage a transparent, data-driven cost-analysis framework aligned with Western procurement standards (Total Cost of Ownership – TCO). Whether you are sourcing a new custom program, transferring existing tooling, or benchmarking, this guide outlines how we calculate value and optimize costs for your project.
1. Tooling (Injection Mold) Cost Analysis
We break down tool costs using standard Value Engineering (VE) metrics to ensure long-term ROI based on your SPI Class requirements.
Total Tooling Cost =Material & Components + Engineering & Design + Machining & Labor + Validation (Tryouts) + Margin + Export Logistics
Typical Tooling Cost Allocation:
• Materials & Standard Components (15% – 30%): Includes mold base (e.g., LKM) and premium core/cavity steel (e.g., ASSAB, Finkl, Schmiedewerke Gröditz) based on volume requirements (SPI Class 101/102). Standard components utilize global brands (e.g., DME, HASCO, YUDO, Mastip).
• Machining, Processing & Overhead (30% – 50%): Precision CNC, EDM, wire cutting, and skilled toolmaker labor.
• Engineering & Mold Design (10% – 15%): DFM (Design for Manufacturability), Mold flow analysis, and 3D CAD modeling.
• Mold Validation & Tryouts (3% – 5%): T0 to T2 sampling, CMM dimensional inspection, and scientific molding validation.
• Packaging & Export Logistics (approx. 3%): ISPM-15 compliant sea/air-worthy wooden crating and anti-rust treatment.
• Note on Taxes: For direct export, Pricing is provided on an FOB, FCA, or DDP basis excluding domestic VAT.
To accelerate your program’s Time-to-Market (TTM) and secure the most competitive, accurate quotation, please provide the following variables in your RFQ:
A. Technical & Data Requirements
• 3D CAD Data: Preferred formats: .STEP, .IGS, .X_T. 2D control drawings (.PDF, .DWG) indicating critical-to-quality (CTQ) dimensions and tolerances.
• Resin Specifications: Exact grade/brand (e.g., Sabic Lexan Polycarbonate) or performance equivalent requests (UL94 flame rating, UV stabilization, FDA compliance).
B. Life-Cycle Volume & Supply Chain Strategy
• EAU (Estimated Annual Volume): This dictates whether we propose a single-cavity prototype tool (aluminum soft steel) or a high-cavity, fully hardened hot-runner production tool (SPI Class 101) to lower your piece-part cost.
• Release Quantities (MOQ): Do you pull in batches of 5,000, or the full 20,000 at once? Batch sizes impact setup amortization and material purchasing power.
C. Program Timeline & Milestones
• T1 Sample Approval Date: When do your design and quality teams need parts for fit/form/function testing?
• SOP (Start of Production): Target date for commercial volume shipments.
D. Aesthetic & Functional Criteria
• Surface Finish: SPI/MT (Mold-Tech) textures, high-gloss polishing, or specific color matching (Pantone/RAL).
• Gate & Parting Line Restrictions: Advise on non-cosmetic zones to ensure gate locations do not interfere with assembly or industrial design.
Injection molding is one of the leading processes for manufacturing plastics. It is widely used for mass-producing identical parts with tight tolerances. It is a cost-effective and extremely repeatable technology that yields high-quality parts for large series production.
It is a fast, intensive process where high heat and pressure are involved to inject molten material inside a mold. The molten material depends on the scope of the manufacturing project. The most popular materials are various thermoplastics, such as ABS, PS, PE, PC, PP, or TPU, but metals and ceramics can be injection molded as well. The mold consists of a cavity that accommodates the injected molten material and is designed to closely mirror the final features of a part.
Normally, the main cost driver in injection molding is the cost of the mold, also known as the tooling cost. The cost of designing and building a mold depends on the required production volume, the complexity of the part design, mold material, and the process used to create the mold.
Simple low-volume 3D printed molds can cost as little as $100, while the cost of designing and manufacturing complex molds for high-volume production may hit the $100,000 mark. Despite the considerable fixed start-up costs, the injection molding process has low variable costs due to the inexpensive thermoplastics materials, short cycle times, and the labor needs decrease progressively due to automation and economies of scale. This means that the variable costs of production are low and the process becomes more efficient and the cost per part decreases at higher volumes as the costs get distributed among hundreds or thousands of parts.
Injection molding is one of the leading processes for manufacturing plastics. It is widely used for mass-producing identical parts with tight tolerances. It is a cost-effective and extremely repeatable technology that yields high-quality parts for large series production.
It is a fast, intensive process where high heat and pressure are involved to inject molten material inside a mold. The molten material depends on the scope of the manufacturing project. The most popular materials are various thermoplastics, such as ABS, PS, PE, PC, PP, or TPU, but metals and ceramics can be injection molded as well. The mold consists of a cavity that accommodates the injected molten material and is designed to closely mirror the final features of a part.
Normally, the main cost driver in injection molding is the cost of the mold, also known as the tooling cost. The cost of designing and building a mold depends on the required production volume, the complexity of the part design, mold material, and the process used to create the mold.
Simple low-volume 3D printed molds can cost as little as $100, while the cost of designing and manufacturing complex molds for high-volume production may hit the $100,000 mark. Despite the considerable fixed start-up costs, the injection molding process has low variable costs due to the inexpensive thermoplastics materials, short cycle times, and the labor needs decrease progressively due to automation and economies of scale. This means that the variable costs of production are low and the process becomes more efficient and the cost per part decreases at higher volumes as the costs get distributed among hundreds or thousands of parts.
Free trade and globalization have encouraged American businesses to move their manufacturing facilities overseas, where they can employ less expensive labor which greatly reduces the cost of manufacturing.
China has advantages when it comes to manufacturing over other Asian countries. One reason for this is the experience and education the country has in delivering products that adhere to the rigorous standards that are required by both western legislation and consumers.
Many retailers are growing less dependent on brand names; this is partly due to their suppliers demanding and receiving good value from Chinese suppliers. When a retailer has two products of equal specifications and one is considerably cheaper, he can provide great value to the end customer by choosing the less-expensive product. Many large, well-known American retailers are thus no longer willing to pay premiums for brand-name products when they can get products of equivalent quality for less money.
China’s low product and labor costs are well known; its advantages in services are often underestimated. Today, when a small or medium-sized importer needs labor-intensive, value-added services, Chinese suppliers and logistics service providers are capable of responding. Since Chinese labor costs a fraction of US labor, it is worth examining whether a particular service can be performed in China.
Regardless of your industry and the injection-molded products you decide to mold in-house, the parameters and rules remain the same. Manufacturing plastic injection molded components in-house as part of a customer’s end product can prove to be a major challenge from an efficiency, quality and cost perspective.
Most companies who successfully outsource plastic injection mold tooling to China have been doing it for many years and although it requires good management control, the total cost reduction is substantial.
The plastic material selection you make for your plastic part is not only critical to the part’s function, it also plays a huge role in its cost to manufacture. Raw plastic material cost can range in price from $1 per pound to $25 per pound. So, care should be taken in plastic part design to minimize the weight of the part when possible.
Choosing the correct plastic type can also help achieve faster cycle times or production rates of your parts to reduce overall costs. For small parts the cost of the material has a small effect on the unit price and the production rate has a large effect. On larger heavier parts the cost of the material has a large effect on the unit price along with the production rate.
$ Material Part Cost = $ Plastic Material Price x Part Weight lbs
Cycle Time and Mold Cavities
“Cycle time” is a term used in our industry for both injection molding and CNC machining. In simple terms it is the amount of time required for a machine to complete one production cycle. The total injection molding cycle time is made up of the following steps:
mold closing time / injection fill time / injection pack/hold time / cooling time / mold opening time / part ejection or take out time / re-cycle time (which would only apply when parts must be ran in a semi-automatic mode with a machine operator)
So how does cycle time relate to part cost? Let’s discuss the primary sources of the non-material related costs for injection molding.
Non-Material Related Costs
Let’s start with the machinery and equipment. Today’s high-tech servo driven injection molding machinery is very expensive. The tonnage size rating of the machine and its surrounding support equipment will determine the overall capital investment required to run production. Small tonnage machine sizes are used for running small molds and small parts, and large tonnage machines are needed to run large molds with large parts.
Even a small injection molding machine along with its support equipment will cost near $100,000 and very large machines will cost millions of dollars. It also follows that the machinery has a finite effective life cycle because it wears out and also loses its technological advantage to newer technology over time, just like everything these days. Knowing the cost being the capital ($) investment in machinery divided by its effective life cycle (time), it’s easy to understand that translates into an hourly operational cost of ownership of the equipment.
Secondary to the capital equipment costs discussed above, would be a combination of fixed and variable costs like a factor for rent on manufacturing space, electrical power usage, etc. Through simple math these costs are also very easy to drill down into an hourly operational cost.
The sum of all non-material related hourly costs combined and calculated out with a profit margin will become what is known as “machine rate” in our industry.
Finally, here is how the simple non-material related cost of an injection molded part is determined by cycle time:
The # of units produced per hour = (3600 sec / cycle time sec) x number of mold cavities
$ Non-Material Part Cost = $ Machine Rate per hour / # of units produced per hour
Since machine rates are all very competitive across the injection molding industry, cycle time and number of cavities in the mold are two significant determining factors in the total cost of a plastic molded part.
Packaging and Extras
Two more items that can really have a big pricing effect on a molded part are packaging and extra operations.
Injection molding is one of the leading processes for manufacturing plastics. It is widely used for mass-producing identical parts with tight tolerances. It is a cost-effective and extremely repeatable technology that yields high-quality parts for large series production.
It is a fast, intensive process where high heat and pressure are involved to inject molten material inside a mold. The molten material depends on the scope of the manufacturing project. The most popular materials are various thermoplastics, such as ABS, PS, PE, PC, PP, or TPU, but metals and ceramics can be injection molded as well. The mold consists of a cavity that accommodates the injected molten material and is designed to closely mirror the final features of a part.
Normally, the main cost driver in injection molding is the cost of the mold, also known as the tooling cost. The cost of designing and building a mold depends on the required production volume, the complexity of the part design, mold material, and the process used to create the mold.
Simple low-volume 3D printed molds can cost as little as $100, while the cost of designing and manufacturing complex molds for high-volume production may hit the $100,000 mark. Despite the considerable fixed start-up costs, the injection molding process has low variable costs due to the inexpensive thermoplastics materials, short cycle times, and the labor needs decrease progressively due to automation and economies of scale. This means that the variable costs of production are low and the process becomes more efficient and the cost per part decreases at higher volumes as the costs get distributed among hundreds or thousands of parts.
Injection molds are subject to thousands of pounds of pressure every cycle. As a result, the molds must be made from very strong materials that can withstand repeated use without deforming. The most common choice for injection molds is steel, with the grade of steel determined by the number of parts to be produced and the material to be injected into the mold. (For example, a fiberglass filled material causes a lot of wear when injected, so the mold would need to be made from a higher grade of steel.)
Another factor that determines injection mold costs is the complexity of the part to be produced. The more complex your part, the more complex and costly the mold. And once made, molds are difficult and many times impossible to modify, removing your ability to modify the design.
Saving costs on manufactured parts is not rocket science. Therefore, you can reduce your injection molding costs without compromising the quality of your produce. The following tips will save you some dollars while working on your molding designs:
1. Avoid Unnecessary features
In most cases, molded part numbers, textured surfaces, and company logos are unnecessary for your designs. They consume extra polymer resin, which will add up to your injection molding costs. However, in some cases like military applications and aerospace, permanent part numbers may be required and cannot be omitted. However, there’s are still ways around that.
You can still save cost by using a mill-friendly font like Arial, Century Gothic Bold, or Verdana (san-serif fonts). To further save cost, you need to do more than opting for these fonts is. You shouldn’t go deeper than 0.010 or 0.015-inch maximum. Going deeper will require more resin, and that is not economical. You should keep your font above 20 pt so that they are legible enough to read. You could use our design guide to check if your design is a good fit for production
2. Only use cosmetics when required
Putting beautiful finish touches on your parts is nice, but some cosmetics should be avoided to save cost. You’ll spend some extra dollars by using EDM, bead blasting, high mold polish, etc., for your design, whereas, in some cases, they are not essential. If they are not needed, you should avoid using them to save cost. However, if you must polish the parts, you can still save cost by polishing half of the mold or the small area needed instead of polishing the entire body.
3. Mold mods
You can re-machine an existing mold to suit your new need instead of purchasing a new one. This process might be complicated, though, but if well done, it’ll save you some dollars, thereby reducing your injection molding tooling cost. Purchase the needed parts, and replace the old parts with them. That way, you’ve upgraded your machine to meet your new need without purchasing a new one.
4. Choose a suitable mold size
You can save yourself unnecessary stress and cost by purchasing a suitable mold size for your parts. Size in this regard refers to how big the pieces you want to design are and the volumes required. Some injection molds are ideal for smaller part quantities, while some are designed for larger quantities. To manage the demand volatility of your parts and leverage cost-efficient bridge tooling, you should choose a suitable mold size. This is another effective way to save injection molding costs.
With the continuous development of injection molding technology, the calculation of injection cost is also changing
While injection molding may seem costly compared to processes like CNC machining and 3D printing, the ability to scale and manufacture thousands of parts makes it a cost-effective solution for mass production. Determining the cost of injection molding is a combination of several factors. The main determinant of molding cost is the amount of time it takes to produce the tooling. This means, the more complex the part’s geometry, the higher your manufacturing costs will be. Simple parts, without undercuts or more advanced surface finishes, will be the most affordable.
Here are 11 injection molding design considerations to stretch your manufacturing dollar:
1. Eliminate undercuts 2. Get rid of unnecessary features 3. Use a core cavity approach 4. Reduce cosmetic finishes and appearances 5. Design self-mating parts 6. Modify and reuse molds 7. Pay attention to DFM analysis 8. Use a multi-cavity or family mold 9. Choose on-demand production option 10. Consider part size 11. Use overmolding