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.
Everyone wants to save money on manufactured parts. It sounds simple, but one of the easiest ways to reduce price-per-piece cost in injection molding is by increasing part quantity. That is because the initial upfront cost to design and machine the mold amortizes over more parts.
At least to some degree, asking what plastic injection molds cost is a lot like asking, “How much is a car?” Will your mold be a Pinto or a Porsche? And don’t forget that the price of a mold is just the beginning. To determine overall plastic injection molding costs for any project, you have to consider raw material, operation, and repair costs later down the road too.
While you don’t need to know every detail about the types of molds available, it’s always a good idea to come prepared. Supplying the basics to your mold builder will help them build the best tool for your project. recommend that you find a mold maker who also has production capabilities. The company running the production won’t want to build an inadequate mold because they know they have to use it.
Injection molding is an established process wherein one may think there are no longer ways on how to alter the process given its straightforward approach. However, as you dwell deep on to plastic manufacturing, you will realize there are far more tricks to the process which will help in reducing injection molding costs or take advantage of cheap plastic molds at a high level manufacturing process.
The checklist below details the various areas of interest that you need to consider when purchasing a mold:
How many check dimensions are required on the print- this will determine the cavity complexity, as well as the part tolerances
Surface finishes which will be necessary
Number of necessary tight tolerances and their requirements
Any required functions in mold operating, such as unscrewing or lifters.
Balanced cooling requirements- these can determine tolerances.
Part resin
Number of cavities in the part, determined by tolerances and part volume required
Tool type, e.g. hotrunner, two plate, or three plate
the size and complexity of its parts,
the gating direction
the tools steel used
the mold accessories brand
an estimated cycle time
and a guaranteed lifespan.
Many factors impact the up-front cost of injection molding projects. To appropriately prioritize and invest in design and engineering processes with the most impact, working with a custom injection molder with proven experience in these areas is essential.
The cost of injection molding parts is related to many factors, but mainly to the following:
The raw materials cost. The cost could be calculated easily, just ask suppliers of raw materials for the price. After the injection molding parts plus its loss (about 3%) multiplied by the price of raw materials, the cost of raw materials can be obtained;
Injection molding cost. You should know the processing cost per hour of the different injection molding machines. Assuming: The processing cost of 100 tons plastic injection molding machine is USD 30.00 / hour, so the processing cost per minute to 0.5 USD;Now you should find out the plastic injection molding cycle time and the mould cavity number, on this case, the estimated injection cycle is 30 seconds, then 1 hour has 60×2 shots, the assumed cavity is 2,then plastic machine processing costs is 30/(60x2x2),its injection molding is USD 0.125/piece.
Secondary process costs.it includes spray / silk printing / plating, and these can be asked from the suppliers respectively.
Packaging costs. According to the injection molding part bulk, the packaging carton / packaging bags and other expenses would be calculated.
transport costs. According to the shipment cost and the loading quantity, the each part transport cost could be calculated
Personnel expenses. Because the above cost does not include the cost of the personnel, the final price should include them.
Profits: it is the real and final part you will get, you could decide according to the factory situation; normally it is 10%-20%.The others like tax…
The mold is a hi-tech product for a special purpose, as a result we should not cater to customers with low price or even selling at a loss. Instead, we should guarantee high quality and a favorable price, and put the quality, precision and service life of the mold in the first place, without overvaluing the mold cost. If you pursue low prices mold, it will be difficult to guarantee the quality, precision and service life of the mold. In the case that mold manufacturing shares the same accounting unit with product development & production, or is financially interrelated with it, its cost price should be quoted as the mold price. Mold price estimation should only include basic cost price of the mold, leaving aside other costs and the profit for the time being. Subsequently, the added value of the mold fee can be extracted from the profit as compensation after the mold is put into production. However, the quotation at this timepoint cannot be used as the actual price of the mold, but only as mold cost in the early development stage. In the future, once the product is successfully developed and profits are generated, the added value of the mold fee should be extracted and returned to the mold maker. The sum of the two forms the price of the mold. At the moment, the price of the mold may be higher than the one obtained in the first scenario, and even with a very high return rate, which is tens or hundreds of times higher than the original mold cost. Of course, it is also possible that the ROI is 0.
Many injection molding companies calculate the cost of injection molding processing based on the number of days the mold receives the order and the number of days the mold is qualified for the factory. If the mold cannot be delivered after many trials, the more days the mold is in the injection molding company, the higher the processing cost. Of course, the cost of mold inspection is also very expensive, so too many mold inspections or uncontrollable is a big blind spot for mold cost control.
There are two situations that need to be analyzed. The first is the rationality of the mold design and the choice of mold materials.
1) Mold design
In general, the design team must have experienced old designers and young engineers who have just graduated. We can’t ask young engineers to design high-level injection molding independently when they first arrive at the injection molding company. They are also experienced mold engineers. If the molds are closed, they cannot be perfect. There will definitely be some details that are not well thought out. One of the most important and effective methods is the collective review. I remember that in the 1970s, I bought a mold book written by a German about mold structure. The most influential to me is the process of making molds mentioned in the book, and the structure of the mold is discussed in detail. This has had the biggest impact on my mold career and I have benefited a lot. Now I believe that everyone has reached a consensus on this issue. At present, there are many simulation methods, such as mold flow analysis, mold structure dynamic analysis, and three-dimensional comparative analysis of test design products, which can minimize the cost increase caused by unreasonable mold design.
Second is the waste of design. If the mold user explicitly wants to produce 500 samples, it is used to open up the market. But if we design injection molding according to the life of 300,000 modules, the cost will be great and it is a waste of design.
2) Procurement of mold materials and injection molding materials
Choose a stable and reputable supplier. It would be a pity if there is a problem with the mold due to greed and cheap purchases. In fact, there are many such examples. Although the responsibility of the supplier can be pursued, the biggest loss is still the mold injection molding company and mold users.