Medical Device Enclosures in Low Volume: Iteration Is the Product
A medical enclosure programme is usually several revisions, not one order. The first article is a test of the design, not the start of production. What matters is how cheaply and how honestly each iteration can be run — and whether the sample price and the production price stay connected.
Fulei Metal builds medical device enclosures from customer drawings in small batches and prototypes, in a 2,500 m² plant in Ningbo, China, since 2016.
How a low-volume medical programme actually runs
| Stage | Quantity | What it is for | What we need |
|---|---|---|---|
| Design verification | 1–5 | Prove the geometry, the fit and the cleanability features | Drawing, even if provisional |
| Clinical or pilot build | 5–50 | Assemble into the device for early use | Frozen revision, finish specification |
| Pre-production | 50–500 | Validate the process route before volume | Annual volume forecast |
| Production | 500+ | Repeat to the frozen revision | Purchase order against the frozen revision |
The failure mode we see most is a supplier who prices the sample as a one-off and then prices production as if it were a different part. The two should be connected: tooling, nesting and packaging decided once, so the sample and the production price stay consistent.
What low volume changes
| Factor | High volume | Low volume |
|---|---|---|
| Tooling | Amortised across a large run | Often avoided entirely — laser cutting and CNC bending need no tooling for most enclosures |
| Nesting | Optimised for material yield | Less critical; a few parts per sheet is acceptable |
| Setup cost | Spread thin | A larger share of unit cost — which is why a single prototype is proportionally expensive |
| Revision control | Changes are costly | Changes are expected; each revision is a new first article |
| Documentation | Batch records | Per-article records, because each unit may go into a device history file |
Because we cut and bend rather than stamp, most medical enclosures need no dedicated tooling at all. That is what makes a 1-off prototype economic and keeps the production route identical to the sample route.
Quotation: what we quote, and when
| What you send | What you get back |
|---|---|
| Drawing, even provisional | Sample price and an indicative production price at your forecast volume |
| Material, thickness, finish | Process route and any manufacturability questions |
| Sample quantity and annual forecast | Whether the job suits a small run — said honestly if it does not |
| Documentation requirement | What records will travel with the parts |
Simple laser-cut and bent parts are quoted within 24 hours on working days (GMT+8). Complex first articles — welded frames, hardware sourcing, coating trials, documentation packages — take longer, and we confirm a quotation date after review rather than guess one.
Documentation for a device history file
| Record | When |
|---|---|
| Material certificate (mill cert) | With the first article |
| First-article dimensional report | Issued with the sample |
| Finish record from the partner line | With the shipment, if requested at quotation |
| Outgoing inspection record | With each shipment |
| Packing photographs | Before shipment, for important orders |
Ask for the records at quotation stage, not after delivery. Chasing a certificate after the parts have shipped costs both sides more than including it in the plan.
The boundary
We build the enclosure. We do not certify the device. IEC 60601-1, IEC 60601-1-2 and biocompatibility requirements apply to the complete equipment, tested by you or the certification body. We do not hold ISO 13485 and do not claim to — our quality system is documented to ISO 9001, with third-party audit evidence available under NDA (TÜV Rheinland MIC-ASI243729, Bureau Veritas MIC-ASR263630).
Frequently asked questions
What is your real minimum quantity?
One, for most enclosures, because we cut and bend rather than stamp. There is no tooling to amortise. The unit cost of a single prototype is high because setup dominates, and we will tell you that number honestly rather than quoting a fictitious MOQ.
Will the production price match the sample price?
Not exactly — the sample carries setup cost that production spreads across the run. What we commit to is that the process route, the nesting and the packaging are decided once, so the sample and production prices are connected rather than independent. Ask for both numbers together and you will see the relationship.
Can you handle a revision mid-programme?
Yes, and we expect it. A revision change is treated as a new first article rather than a silent update. That costs more and takes longer, and it is the reason a repeat order comes out like the first one.
Do you keep our drawings on file for repeat orders?
Yes, against the frozen revision. Send the revision identifier on a repeat order and we build to the same route, the same inspection plan and the same packing.
What lead times apply to a prototype?
Simple laser-cut and bent prototypes 3–7 days. Complex first articles — welded frames, hardware sourcing, coating trials, documentation packages — 15–20 days. Production batches 25–35 days, quoted after drawing review.
Can you sign an NDA before we send the drawing?
Yes. Tell us and we will send ours, or we will review yours.
Send the drawing and the volume forecast
Send the drawing, even if it is provisional, with the sample quantity and your annual volume forecast. We will quote the sample, an indicative production price, and tell you honestly whether the job suits a small run.