Prototyping in Shenzhen

Prototyping is where hardware projects live or die, fast iteration with realistic materials lets you find problems while they’re cheap to fix, slow iteration with the wrong materials means you discover problems after tooling is cut. Bao’an’s prototyping ecosystem is purpose-built for this loop: every major prototyping process sits within a 15km radius, samples ship overnight to Hong Kong, and the same shops that build your prototypes often run pilot and production volumes. For a hardware founder, that means you can move from sketch to functional prototype to user-test batch to pilot production without changing geography.

What this covers

This page covers physical prototyping services available in Shenzhen: 3D printing (SLA, MJF, FDM, SLS, DLP), CNC machining quick-turn (3–7 days for aluminium and engineering plastics), urethane casting from silicone moulds, vacuum casting, PCB quick-turn fabrication, PCBA prototype assembly, 3D-printed jigs and fixtures, and prototype paint, plating, and finish services. It does not cover full pilot production runs (covered under the specific process pages, injection moulding, CNC machining, PCBs) or custom electronics design services.

What Shenzhen and the PRD are uniquely good at

• Co-located processes. SLA, MJF, CNC, PCB fab, PCBA, and finish services all sit within a 20km radius. A multi-process prototype (CNC enclosure + SLA front face + custom PCBA inside + spray paint) lands in your hand in 5–7 days.
• Production-supplier prototyping. Many Bao’an CNC and injection-mould suppliers will run prototypes themselves, surfacing DFM issues during prototyping instead of discovering them after tooling.
• Cost. Prototype pricing is 40–60% lower than US/EU equivalents at similar quality.
• Overnight finishing. Spray-paint, silk-screen, laser-etch, and pad-print can be added to most prototypes with same-day or next-day turnaround.
• PCB quick-turn. 24-hour 2-layer FR4 is a real service from multiple tier-1 Bao’an houses; 48–72h PCBA is realistic for moderate-complexity boards.

Sub-categories

MOQs and lead times

Price bands

All prices at the stated quantity, ex-works Shenzhen, May 2026. USD conversions at ¥7.2. Reference part: roughly 80×60×30mm with moderate complexity.

Specs to lock down

• For 3D printing: STL or STEP file, material grade, layer height (50–100 µm typical for visual, 100–200 µm for functional), post-processing (sanded, painted, dyed), tolerance expectation (±0.2mm typical for SLA, ±0.3mm for MJF, ±0.5mm for FDM)
• For CNC: STEP + drawing, material grade and temper, critical tolerances, surface finish (Ra)
• For urethane casting: master quality requirement (typically SLA-printed), material spec (Shore hardness for elastomers, equivalent properties for rigid PU like “PC-like” or “ABS-like”), colour, batch size
• For PCB quick-turn: Gerbers, drill file, stackup, surface finish, soldermask colour
• For PCBA prototype: BOM with MPN, centroid file, consignment vs supplier-sourced parts
• For finishing: paint colour with Pantone reference, finish (matt / satin / gloss), masking spec, print artwork file with placement

Process

1. Define the question the prototype needs to answer (looks, fit, function, user testing, regulatory submission).
2. Select prototyping process matched to the question.
3. CAD prep: tessellation tolerance for STL (typically 0.05mm chord height), wall thickness check, draft angle review if pre-mould prototype.
4. Quote with file submission; quotes typically returned within 4–24 hours.
5. Approve quote, place order, ship file to production.
6. Production: 24h to 7 days depending on process.
7. QC at the prototyping shop: visual, dimensional check on critical features.
8. Ship via overnight courier to Hong Kong, then international air.
9. Hands-on evaluation against the prototyping question, decide next iteration.

QC specifics

• 3D-printed parts: dimensional check on 3–5 critical features, surface finish visual, defect inspection (layer lines, voids, support marks).
• CNC parts: hand-caliper check on critical dimensions, surface finish visual, no sharp burrs.
• Urethane-cast parts: visual for bubbles and short shots, dimensional verification of first part out of mould, batch consistency check.
• PCB quick-turn: visual for trace defects, continuity test on critical nets.
• PCBA prototype: visual for solder quality, basic power-on and smoke test, functional verification if test fixture available.
• Painted / finished parts: colour match check, finish uniformity, no overspray on masked areas.

What goes wrong

1. 3D-printed part doesn’t match CAD dimensions. Mitigation: tessellation tolerance set correctly, design with shrinkage allowance, verify dimensions on receipt before approving next iteration.
2. SLA resin part brittle or yellowed. Mitigation: spec the right resin grade for the application (tough resin for snap-fits, clear engineering resin for cosmetic), UV-stabilise if outdoor use.
3. CNC quick-turn part loses tight tolerance to save time. Mitigation: call out tight tolerances explicitly; accept that quick-turn typically defaults to ±0.1mm and demand CMM if tighter.
4. Urethane-cast batch has cosmetic voids. Mitigation: vacuum-cast vs standard urethane cast; first-part inspection before completing the batch.
5. PCB quick-turn arrives with soldermask issues. Mitigation: review approval is brief; spec colour and minimum thickness; visually compare to your standard before assembly.
6. PCBA prototype non-functional due to incorrect part substitution. Mitigation: explicit “no substitutions” on prototype BOM; LCSC-sourced parts with documented MPN.
7. Paint colour doesn’t match Pantone or reference. Mitigation: physical reference panel sent to shop; colour-match approval before painting the full batch.

Certifications

Prototyping is generally pre-certification, so formal cert documentation rarely applies at this stage. Useful to specify:

• Material safety / restricted substances if prototypes will be used by humans (urethane resin properties for skin contact, paint formulation for child-accessible parts).
• Process compliance for medical or regulatory submissions, some labs require prototype materials to match the production-intent material spec for pre-clinical or pre-submission studies.
• RoHS-compliant materials when prototypes need to validate end-product compliance.

Trade shows

• TCT Asia (Shanghai) (March), additive manufacturing and prototyping technology; useful for evaluating equipment suppliers and emerging materials.
• Formnext (Frankfurt) (November), international additive manufacturing; not in China but PRD prototyping suppliers often exhibit.
• HKTDC Electronics Fair (April, October), PCB and PCBA prototype suppliers exhibit.
• Productronica China (Shanghai, March, biennial), equipment side, useful to gauge what processes your suppliers run.
• CCMT / CIMT (Shanghai or Beijing), machine tools side, including CNC prototyping equipment.

When to use us

Prototyping is where time is most valuable, every wasted iteration cycle is a week off the launch. The sourcing desk handles process selection, supplier shortlisting, quote review, and prototype shipment coordination, most useful when your team is iterating remotely and needs a Shenzhen-based hand to keep prototypes moving. The hardware founder tour is the in-person version, sitting in CNC shops while your part is cut, walking PCB quick-turn lines, and watching urethane casting from master through batch in real time.

Last reviewed: 23 May 2026.