How to Get a Plastic Injection Mold Quote: Step-by-Step Guide for 2026

Getting an accurate injection mold quote is a data problem before it is a negotiation problem. Suppliers who receive a complete package — 3D model, drawing with the critical tolerances marked, exact resin grade, annual volume and required tool life — quote within a day or two and rarely revise. Suppliers who receive a one-line email quote a number they will change twice. The quality of the quote you get is set by the quality of the request you send.

Key takeaways

  • Send a package, not a question: model, drawing, resin grade, volume, tool life, finish standard.
  • Ask for an itemised quote. A lump sum cannot be compared with another lump sum, and it hides where the money is going.
  • State the tool life you need in shots. It is the single input that decides the steel grade, and it changes the price legitimately.
  • Expect a DFM report with the quote. A supplier who will not review the part design before pricing it is quoting a shape, not a part.
  • The cheapest quote is rarely the best value; the cheapest quote with no breakdown is never the best value.

In this guide

  • 1. Prepare your design package
  • 2. Write the specification, not just the request
  • 3. What a supplier actually evaluates
  • 4. Send the same RFQ to several suppliers
  • 5. Compare quotes beyond the price
  • 6. The five questions that expose a weak quote
  • 7. After the quote: freezing the design
  • 8. How we quote

1. Prepare your design package

  1. 3D model in STEP or IGES. A native CAD file is a bonus; STEP is the workable minimum. If the model has unresolved surfaces, fix them before sending — a supplier who has to repair the geometry will either charge for it or guess.
  2. 2D drawing with the critical dimensions and tolerances marked, and the rest declared general. A drawing with a blanket tight tolerance in the title block tells the supplier you have not decided what matters.
  3. Exact resin grade, including filler content and any colour or additive requirement. “ABS” is not a specification; “ABS, 20% glass filled, UV stabilised, natural” is.
  4. Annual volume and required tool life in shots. This decides steel, cooling and cavity count.
  5. Surface finish and texture, with the areas it applies to — the visible face is usually a different standard from the internal ribs.
  6. Target lead time, honestly stated, with the cost of missing it.

2. Write the specification, not just the request

If you want comparable quotes, you have to specify what you are buying. The tool specification is the document that does it, and it should name at least:

  • Steel grade for cavity and core, and for any inserts.
  • Frame standard — LKM, DME, HASCO or equivalent.
  • Cavity count, and whether the runner is cold or hot, with the hot runner brand if specified.
  • Cooling requirement, particularly whether hard-to-reach areas need baffles or bubblers.
  • Ejection, slides and lifters expected for the geometry.
  • Polish and texture standard for the cosmetic surfaces.
  • Spare parts — spare core, spare cavity insert, spare ejector pins.
  • Documentation — dimensional report, process parameter sheet, 2D tool drawings.

Without this, two suppliers are quoting different things and the price difference is meaningless. With it, the difference is a genuine difference in cost base and capability, which is what you actually wanted to learn.

3. What a supplier actually evaluates

Input What it decides Effect on price
Part complexity Machining hours, side actions, EDM work Largest driver
Cavity count Frame size, cooling, fitting hours Large, non-linear
Resin and filler Steel grade, gate design, wear allowance Moderate
Required tool life Steel grade and hardness Moderate
Tolerances Machining strategy, inspection, scrap risk Moderate to large
Surface finish Polishing hours, or texture step Moderate
Mold size Frame, machine hour rate at the moulder Moderate
Lead time Scheduling and overtime Occasionally large

Notice that of the eight inputs, six are things you decide. That is the useful insight: most of a tool price is specified by the buyer, not set by the supplier.

4. Send the same RFQ to several suppliers

Send an identical package to three to five suppliers who are plausible for your part — not five random names. The point is to learn the market rate for your specification, and to find out whether any of them pushes back on the design. A supplier who says “this wall will not fill” or “this tolerance is unrealistic on this feature” is doing engineering, not quoting.

Give them the same deadline and the same information. Suppliers who receive a partial package will price optimistically and then revise upward, and those revisions are how a project budget gets destroyed after the order is placed.

5. Compare quotes beyond the price

Our answer: the comparison that matters is not the total, it is the breakdown. Ask each supplier to separate design and DFM, steel and frame, machining and EDM, hot runner, cooling, polishing and texture, and trial. Then look for three things:

  • Missing line items. A quote with no cooling line item, on a part where cooling sets the cycle time, is not a cheaper quote — it is an incomplete one.
  • Vague steel. “Hardened steel” is not an answer. The grade and hardness should be named.
  • No trial or no documentation. Cutting these is the easiest way to shave a quote, and the most expensive thing to be without when the tool arrives somewhere across an ocean.

Then compare lead time, warranty, the standard of the DFM report, and how much of the process is documented in writing. A supplier who is explicit about their limits and shows you the evidence is easier to work with than one who agrees with everything.

6. The five questions that expose a weak quote

  1. “Which features carry the tight tolerance, and how will you measure them?” The answer should name the features and the instrument.
  2. “What steel grade and hardness, and why that one?” A reason tied to your volume and resin is the right answer.
  3. “What is the DFM report going to tell me?” Fill, gate options, cooling, and the changes they recommend. Not a screenshot.
  4. “What exactly arrives with the trial?” Samples, photos, video, process parameter sheet, dimensional report.
  5. “What is included in the warranty, and for how long?” A defined period and a definition of what is covered.

Any of those answered vaguely is a reason to keep looking, regardless of price.

7. After the quote: freezing the design

The most expensive line in any tooling project is a change after kick-off. Before you place the order, make sure the part is genuinely frozen: that the resin is chosen, the wall thicknesses are settled, the cosmetic surfaces are agreed with marketing, and the assembly interfaces are confirmed. Where a change is unavoidable later, expect welding, re-machining or a new insert, and expect it to cost more than it would have at the design stage.

8. How we quote

Our answer: send the model, the drawing and the volume, and you get back a written DFM report within three working days at no cost, together with an itemised tooling quote. Design is done in UG and checked in Moldflow. We build 20 to 30 sets a month in our own toolroom, with maximum mould size 1,600 × 1,000 × 500 mm, up to 15 t and cavity counts up to 48; critical mould dimensions are machined to ±0.005 mm on 13 CNC machining centres with travels up to 1,600 mm, six EDM machines including Sodick mirror-finish and twin-head units, three wire EDMs and five surface grinders. A tool cut to that accuracy holds ±0.01 mm on critical moulded dimensions, subject to the resin and the part geometry. Lead time to first article is typically 35 days for a simple tool, 42 for a medium one and 50 for a complex one. We make molds in-house and run trials and production through vetted partner factories, and trial delivery is samples, trial photos, a trial video, the process parameter sheet and a CMM dimensional report, traceable by mold number.

For the checklist we use to assess suppliers, see How to Choose an Injection Mold Manufacturer in China, and for the pricing side How Much Does a Plastic Injection Mold Cost?.

Related guides in this series

This article is part of our Injection Molding Cost Guide — a full walkthrough of the topic with the numbers and checklists behind each decision.

Get an engineering answer, not a sales pitch

If you are working on your mold quote, send us the part and the target volume. We will come back with a design review, a tooling recommendation and an itemised quote — and if a different process or material is a better fit for your volume, we will say so. Talk to a manufacturing engineer.