A 200-unit trial run does not need a 120,000 RMB production tool. Choosing the tooling tier by the wrong criterion is one of the most expensive mistakes in small-batch production, and the money is only part of the cost.
Why designers should care: tooling is quoted per mold, but it is selected per purpose. Knowing what the trial run is actually for tells you which tier to buy, and what you will not be able to test if you buy the cheapest one.
The direct answer, in three tiers: soft molds (silicone, resin or low-strength alloy) cost 5,000 to 15,000 RMB and deliver in about a week, but last only tens to a couple of hundred shots and cannot run ABS or PC. Aluminum molds cost 20,000 to 40,000 RMB, hold roughly ±0.1 mm and run several hundred to one or two thousand shots. Rapid steel molds, simplified single-cavity tools in softer steel such as P20, cost 30,000 to 60,000 RMB and run a few thousand shots. For 100 to 500 units in a real engineering plastic, an aluminum mold is usually the right balance.
Tier 1: Soft Molds - The Cheapest Ticket In
The core answer: soft molds are the fastest and cheapest way to get a physical part, and the wrong way to promise delivery. A set runs 5,000 to 15,000 RMB with a lead time that can be compressed to under a week, which makes it the standard choice for very early testing below 100 units.
The limits show up quickly. Silicone tooling typically survives only tens to a couple of hundred shots. Dimensional accuracy lands around ±0.3 mm, and the part may carry a visible parting line. Most importantly the material is restricted: soft tooling suits free-flowing, lower-strength plastics such as silicone, TPU and PP. Testing the strength of ABS or PC is simply not possible.
We have seen this fail in the field. A client produced a functional prototype from a soft mold, and early user feedback was excellent. They then took that "perfect prototype" to a channel partner to sell stock, and the soft mold could not keep up. The following 100-unit order could not be delivered on time, and the customer relationship nearly ended. A soft mold validates a design; it does not honor a sales commitment.
Tier 2: Aluminum Molds and Rapid Steel Molds
The core answer: this is where cost meets tool life. When you need 300 to 500 units and the material must be an engineering plastic such as ABS or PC, the choice is between an aluminum mold and a rapid steel mold.
Aluminum molds cost 20,000 to 40,000 RMB. Aluminum is softer than steel and machines faster, which is why it costs less than a conventional steel tool. Accuracy reaches ±0.1 mm with a life of several hundred to one or two thousand shots. For the speaker project mentioned above, a 200-unit order made an aluminum mold at roughly 30,000 RMB the more prudent choice: the parts are almost indistinguishable from final production parts, so the launch quality can be simulated honestly.
Rapid steel molds are simplified steel tools: often single cavity, in a softer grade such as P20, without complex hot-runner systems. Cost lands around 30,000 to 60,000 RMB with a life of a few thousand shots. They outlast aluminum, but remain a simplification compared with a full production tool.
The decision line: with a budget of 20,000 to 50,000 RMB, a requirement of 100 to 500 units, and a need to validate the real material and the real molding process, choose the aluminum mold first. Rapid steel molds suit a requirement closer to small-scale sales, above roughly 500 units, where the tool is expected to bridge into early production.
Tier 3: Four Questions Before Choosing a Mold
The core answer: do not start by asking which mold is cheapest. Ask these in order.
1. What is the core job of this batch? Showing functionality to investors, letting early users try it, or selling it to recover cost? If it is the last one, quality requirements are high and a soft mold is effectively excluded.
2. Is the quantity fixed? Fifty units and five hundred units follow completely different tooling logic. Quantity is the hard constraint.
3. Can material and surface finish be compromised? If only the structure needs validating, the difference between ABS and PC matters less and a soft mold can still work. If the plan includes painting or IMD, an aluminum or steel mold is required.
4. Are the schedule and the budget locked? Tight money and tight time make a soft mold the only option. With a little more room, an aluminum mold does the job properly in one pass.
Cost is not the only price of a mold. Waiting and failure are the other two. Delays from the wrong tool, quality that misses the target, and sales commitments that cannot be met all cost far more than the price difference between tiers. At the trial production stage, tooling spend is better understood as validation investment.
Tier 4: What Designers Can Take Away
Match the tool to the purpose, not to the unit price. A 120,000 RMB production tool for a 200-unit channel test spends most of its value on shots that will never be taken.
A soft mold validates, an aluminum mold demonstrates, a steel mold supplies. Each tier answers a different question, and the questions are not interchangeable.
Neither aluminum nor rapid steel molds can be upgraded in place. What carries over is the design data and the validation conclusions, which is exactly the most expensive part of the trial-and-error phase. A production tool is designed and built fresh, with full cooling, multiple cavities and long life.
Ask for an itemized mold quote. Material grade, machining processes such as CNC, EDM and wire cutting, and whether trial shots and mold repair are included all matter more than the total. Real quotes list the steel grade, for example 718H or NAK80, estimated machining hours, standard component brands and the number of trial shots before delivery.
FAQ: Small-Batch Tooling Questions
Q1: Can soft-molded parts actually be sold?
A: They can be sold, but the customer must be clearly told the parts come from a soft mold, a non-production process, with material strength, surface precision and batch consistency that cannot match production parts, and with no guarantee of continued supply. Soft-molded parts suit a limited edition or prototype release to a very small fan base or a crowdfunding campaign, not regular commercial channels. Marking the product as a prototype in the sales contract matters, because it prevents later quality disputes.
Q2: Can an aluminum or rapid steel mold be upgraded into a production mold later?
A: Not directly, but the mold design data and the product validation conclusions carry over completely, which means the most expensive trial-and-error phase is already done. The value of an aluminum or rapid steel mold is confirming design feasibility, manufacturability and market acceptance. Once that passes and mass production is decided, a new production steel tool is designed and built from the validated data, with full cooling and heating, multiple cavities and long life.
Q3: How do you judge whether a mold factory's quote is reasonable?
A: Ask for an itemized quote and focus on material grade, machining processes such as CNC, EDM and wire cutting, and whether trial shots and mold repair are included. Comparing totals alone tells you very little. A reasonable quote lists the steel grade, for example 718H or NAK80, estimated machining hours, standard component brands and the number of trial shots before delivery. Take that list to two or three suppliers; the differences usually appear in how tightly they control machining detail and material cost.
Hertz Industrial Design (Dongguan, China) works across product appearance design, structural design, packaging design and CMF, and more than 320 of its designs have reached mass production. Website: www.hezidesign.com.
Originally published on the Hertz Industrial Design website (hezidesign.com), Design & Craft column.
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