Sourcing and partners
How to choose an additive manufacturing supplier in the UK: a buyer's checklist
Choose an additive manufacturing supplier on evidence, not the headline price: who reviews your file, what is inspected, which certificates can be verified, and who answers when a batch goes wrong. Send the same part, finish and quantity to each supplier, including us, and score every reply against the checklist below.
Reviewed by HenleyPrint3D engineers4 min readUpdated
Key takeaways
- Compare on the same part, finish, quantity and inspection requirement.
- Verify certificates yourself; "aligned to" is not "certified".
- Ask what the lead time includes: finishing, inspection and transit.
- Marketplaces suit routine, fully specified parts; a partner suits critical or evolving ones.
- Run one trial order before committing a programme.
Suits
Procurement, engineering and programme managers qualifying a UK additive manufacturing supplier for prototypes or low-volume parts.
Worth knowing
We are one supplier among many. Use the checklist to test us as hard as anyone else.
The qualification checklist
| Area | Ask | What a good answer looks like |
|---|---|---|
| Engineering review | Who reviews my file before it is printed? | A named engineer who suggests process, material and orientation changes. |
| Process fit | Which processes and build volumes do you run? | Specific figures, for example FDM to 1000 × 1000 × 1000 mm, SLA 350 x 250 x 250 mm, SLS PA12 165 x 165 x 300 mm. |
| Tolerance | What can you hold, on which features? | A stated figure per process, confirmed against your drawing at quote. |
| Material control | How is material identity recorded? | Material and lot recorded per part. |
| Repeatability | How is batch two matched to batch one? | Recorded machine, orientation and settings. |
| Inspection | What is checked, and what is extra? | A list that separates every-build checks from by-arrangement ones (CMM, scanning, CT). |
| Certificates | Which are held, and can I see them? | A current certificate you can verify, or a plain statement that certification is in progress. |
| Confidentiality | NDA, data storage, export control? | NDA before files; export-controlled work by email first. |
| Lead time | What does the date include? | Build, finishing, inspection and transit, committed in the quote. |
| Escalation | Who do I talk to when something is wrong? | A named person you can phone or email directly. |
Our own answers are on the quality control and certifications pages. We are working towards ISO 9001.
Red flags when choosing a supplier
- A certificate logo with no certificate number or scope you can verify.
- "Aligned to" or "compliant with" wording presented as if it were certification.
- A fixed price and date with no question about the duty, tolerance or finish.
- No named person or engineer you can speak to.
- No record of which material lot made your part.
- A supplier who says yes to every capability, clearance and standard.
- Lead time quoted for the build alone.
Comparing online marketplaces with an engineering partner
Run the same part through each route. Platforms such as Protolabs, Hubs and Craftcloud are quick for fully specified parts and show the price up front. A partner running its own machines adds engineer review and keeps the records in one place. Compare total cost, including finishing, inspection and reorders.
| Factor | Marketplace or network | Engineering partner |
|---|---|---|
| Quoting | Often instant and automated | Quick, with engineer review where needed |
| Who makes the part | Often one of a network | One known team and machines |
| Reorder consistency | Depends on routing | Controlled in one place |
| Documentation | Depends on the supplier | Agreed with you |
| Best for | Routine, well-specified parts | Critical, evolving or documented parts |
Many teams use both. For more detail, see UK alternatives to Protolabs, Hubs and Craftcloud and online platforms versus a UK engineering partner.
Get a comparable quote on your own part
Send the same file you sent elsewhere. Compare process advice, inspection, records and dispatch date side by side.
Extra checks for defence and aerospace buyers
- Ask for the supplier's written position on security clearance, export control (ITAR/EAR), AS9100 and MOD approval. A small supplier that holds none should say so.
- Agree which parts are non-critical enough for an uncertified source.
- Agree the records you need at quote, not after the build.
- Run a trial batch first.
See the defence additive manufacturing supplier guide, the aerospace additive manufacturing supplier guide, and our defence and aerospace industry pages.
A simple trial-order plan
- Pick one representative part with a tolerance that matters.
- Send identical files, finish and quantity to two or three suppliers.
- Compare the engineer feedback, the stated tolerance, the dispatch date and the records offered.
- Measure the delivered parts yourself on the features that matter.
- Choose one supplier, then keep reorders of the finished design with them.
The 3D printing quote comparison checklist sets out the RFQ contents and a more detailed trial-order method.
Frequently asked questions
How do I choose an additive manufacturing supplier in the UK?
Send the same part, finish and quantity to two or three suppliers. Compare engineer feedback, stated tolerance, inspection, records, certificates and the committed dispatch date.
Which certificates should I ask for?
Ask for current certificates relevant to your requirement, such as ISO 9001 or AS9100, and verify them. We are working towards ISO 9001 and hold no AS9100 certificate.
Is an online marketplace good enough for production parts?
It can be for well-specified, low-risk parts. For critical parts, controlled batches or documented quality, a partner with its own machines and direct communication is usually safer.
What are the biggest red flags in a supplier?
Unverifiable certificates, "aligned to" presented as certified, no named engineer, no material lot record, and a lead time that covers the build only.
What should a lead time include?
Build, finishing, inspection and transit. Ask for a committed dispatch date in the quote.
Can I use more than one supplier?
Yes. Many teams use a marketplace for routine parts and a partner for critical, evolving or documented work.
Get started
Talk to an engineer about your part.
Send your CAD, or describe the problem and the duty. We recommend the process, material and finish, and quote with the dispatch date up front.
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