Sourcing
The molder you pick will hold your tool, your process, and your schedule for years. Price is the easy part to compare. This checklist covers the parts that are harder to see and harder to undo.
Why it matters
Switching later is possible, but it costs time, samples, and often a round of requalification.
Most buyers compare molders on the first quote: tooling price, piece price, and lead time to first samples. Those numbers matter, but they describe the first few weeks of a program that may run for years. Once steel is cut, the tool sits in the molder's shop, the process window lives in their setup sheets, and your approved samples were made on their press. Moving all of that is slow.
The better question is not who quotes lowest today, but who will still be giving you good parts, clear answers, and predictable prices after the third engineering change and the first material shortage. That depends on how the molder works, not only on what they charge.
The checklist below is organized in the order a sourcing project usually runs: what to settle on your side before you ask anyone, what to ask each candidate, how to read their answers, and how to shortlist without betting the whole program on a single quote.
Before the RFQ
Molders can only quote what you send. Gaps in the package turn into assumptions, and assumptions differ between suppliers.
A clean CAD model in a neutral format, plus a drawing that marks critical dimensions and tolerances
The resin, or the properties the resin must meet if you are open to alternatives
Cosmetic requirements: which faces are visible, the texture or polish, and where gate marks and ejector marks are acceptable
Realistic annual volume and order size, including the ramp, not only the peak year
Who should own the tool and where it will live, stated up front
Inspection expectations: first article report, dimensional report on samples, and any ongoing checks
Secondary operations such as printing, inserts, assembly, or special packing
The delivery point and shipping term you want quotes on, so prices compare on the same basis
The questions
You are listening for specifics. A vague yes to everything is a weaker answer than a clear no with a reason.
| Area | Ask | A good answer shows |
|---|---|---|
| Tool ownership | Once I pay for the tool, who owns it, and can I move it? | Ownership stated in the terms, including what happens to a shared mold base, and a defined process for releasing the tool |
| DFM review | What will you check on my part before quoting or cutting steel? | Written feedback on draft, wall thickness, undercuts, gate location, and cosmetic risk, tied to your actual geometry |
| Tool build | Who designs and builds the tool, and how do I see progress? | A named tool design review before steel is cut, and milestones you can track |
| Sampling | What do I receive with first samples? | Parts from the production tool with a dimensional report, and a clear list of what still needs tuning |
| Quality system | How do you control the process once parts are approved? | Documented process settings, in process checks, and a way to trace a lot back to its material and run |
| Change control | What happens if you want to change resin, press, or site? | A rule that such changes are notified and approved by you first, with samples if needed |
| Tool maintenance | Who maintains the tool, and who pays when it wears? | Routine maintenance described, and a clear line between wear, damage, and design changes |
| Communication | Who is my contact, and how fast do engineering questions get answered? | A named contact with engineering access, and answers in writing |
Reading the answers
No single signal decides it. Patterns across several do.
Comparing quotes
Two quotes can differ because the suppliers assumed different things, not because one is cheaper.
Line the quotes up by what they include. Check the tool type and expected tool life, the number of cavities, whether texture and polish are in the tooling price, how many sample rounds are covered, and whether tuning after first samples is included or charged separately. A lower tooling price often reflects a simpler tool, fewer cavities, or fewer included revisions.
Do the same for piece price. Confirm the resin grade and color method, the order quantity the price is based on, packing, and the delivery term. A quote on factory pickup and a quote delivered to your door are not the same number, even when the part price looks close.
Then look at total cost over the life of the program rather than the first order. A tool that runs cleanly with fewer rejects and less maintenance downtime can be the cheaper choice even when its price is higher, because the piece price and the reliability of supply matter for every order that follows.
Shortlisting
Each step narrows the field with evidence, not impressions.
Send the same CAD, drawing, and requirements to every candidate so answers compare directly.
The molders who ask about your cosmetics, tolerances, and volumes are the ones reading your part.
Adjust for tool scope, cavities, included revisions, and delivery term before ranking price.
Ask the finalists for written DFM notes. The depth of the notes tells you how they will handle problems later.
Ownership, maintenance, change notification, and inspection belong in the order, not in an email thread.
Judge sample quality, reports, and communication on a first run before committing the full program.
FAQ
Enough to see a range, and few enough that you can review each answer properly. Many teams use a small shortlist and spend their time on the DFM feedback and terms rather than on collecting more prices.
It simplifies accountability. When the toolmaker and the molder are the same team, problems found in sampling get fixed without a debate over whether the tool or the process is at fault. If they are separate, agree in advance who owns tuning and who pays for changes.
The risks are different rather than larger by default. Distance makes written specifications, clear ownership terms, and good sample reports more important, and it adds freight and customs to the cost. Many programs manage it well with clear documentation and a named contact.
Tool ownership, where the tool is stored, maintenance responsibilities, how design and process changes are approved, the inspection documents you expect, and the delivery term.
It shows a management system is in place. It does not show how well your specific part will be made. Sample reports, process controls on similar parts, and how the molder handles a nonconformance tell you more.
Keep reading
Go deeper on the topics in this checklist.
How to move a tool and a process to a new molder without a gap in supply.
Supplier transition playbookOwnership, documentation, and what to put in writing.
Tooling IP protectionWhat drives a tooling quote and how to compare them.
Read the tooling guideWhen it makes sense to keep molding in house.
In house vs outsourcedThe design checks a good molder should run on your part.
Design for manufacturingWhat a first article report covers and why it matters.
First article inspectionNext step
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