PCB Prototype in 24 Hours: Best Services, Costs & Quality Comparison 2025
RayMing leverages over 20 years of PCB manufacturing experience to provide rapid, budget-friendly prototyping solutions.
If you’ve ever sat at your bench at 11 p.m. waiting for boards to arrive so you can run an EVT cycle the next morning, you know exactly why this article matters. The PCB prototype is the single point in any hardware project where ideas stop being theoretical and start being either a working product or an expensive lesson. And in 2026, getting a PCB prototype made in 24 hours is no longer remarkable ¡ª it’s the baseline most engineering teams plan around.
I’ve been spec’ing and ordering prototype boards for over a decade, and the landscape has changed dramatically in the last three years. JLCPCB pushed pricing to the floor. PCBWay made specialty stack-ups accessible to anyone with a Gerber file. 91°µÍø and a handful of others raised the quality ceiling for engineering-grade prototypes. The trick now isn’t finding a fab ¡ª it’s matching the right fab to the right job, because the wrong choice will cost you days or kill your design margin.
This guide walks you through everything I wish I’d known when I started: what a PCB prototype actually involves, how 24-hour services work behind the curtain, what they really cost, and which manufacturers I’d pick depending on what you’re building. I’ve also pulled together a comparison table, a DFM checklist, and free engineering resources at the end.
What Is a PCB Prototype? An Engineer's Working Definition
A PCB prototype is a small-batch, fully manufacturable version of a printed circuit board built to validate a design before committing to production tooling. Most prototype runs land between 5 and 50 pieces, depending on whether you’re at engineering validation (EVT), design validation (DVT), or pilot production (PVT).
The point of a PCB prototype isn’t to be cheap per unit ¡ª it’s to surface every problem that simulation and design rule checks can’t catch. Solder mask alignment that drifts on tight pitch BGAs. Impedance that drifts 4¦¸ because your stack-up calculator assumed the wrong dielectric constant. A power plane that gets 18¡ãC hotter than your thermal sim predicted. Real boards reveal real problems.
A quick example from a project I worked on last year: we ran a buck converter design through three rounds of LTspice simulation with textbook-clean output. The first PCB prototype came back oscillating at 2 MHz under load. Turned out the via stitching pattern under the inductor was creating a parasitic loop that simulation never modeled. We fixed it in revision two, but only because the prototype exposed it. That’s what a PCB prototype is for.
PCB Prototype We Served
How a PCB Prototype Differs From a Production Board
| Attribute | PCB Prototype | Production PCB |
|---|---|---|
| Quantity | 1¨C50 pieces | 500 to millions |
| Lead time | 24 hours ¨C 7 days | 2¨C6 weeks |
| Cost per board | Higher (low-volume) | Optimized via panelization |
| Materials | Often standard FR-4 | Selected for full lifecycle |
| Quality target | Functional verification | IPC Class 2 / Class 3 reliability |
| Tooling | Shared/digital | Dedicated tooling |
| Design rules | Loose, easy to revise | Locked & DFM-frozen |
The mistake I see junior engineers make most often is treating the PCB prototype as a production board. They over-specify it ¡ª controlled impedance on traces that don’t need it, ENIG on a board that’ll see five reflow cycles total, 6 layers when 4 would prove the concept. Spec for what you need to learn from the prototype, not what the production board will eventually be.
Stages of PCB Prototype Builds You’ll Run Through
Most product programs go through three prototype phases:
- Alpha (EVT): 5¨C10 boards, often manually assembled, used to verify the schematic and core functionality.
- Beta (DVT): 15¨C25 boards, assembled to production intent, run through environmental and reliability tests.
- Pilot (PVT): 30¨C100 boards, built on the production line at low yield risk to qualify the manufacturing process itself.
Knowing which phase your PCB prototype is for tells you which manufacturer fits ¡ª and which corners you can safely cut.
The 24-Hour PCB Prototype Era: How Speed Became Standard
When I ordered my first prototype in 2013, two-week lead times were normal. By 2018, a week was standard. Today, simple two-layer boards routinely ship in 24 hours from China, and same-day service exists for engineers willing to pay U.S. premiums.
Three forces drove that compression:
Automation in CAM and panelization. Manufacturers like JLCPCB now run lights-out CAM tooling. The Gerber file you upload is DFM-checked, panelized, and queued for production within minutes ¡ª not hours.
Dedicated rapid-prototype lines. PCBWay and 91°µÍø run separate fabrication lines for quick-turn jobs, isolated from volume production so your one-off doesn’t sit behind a 50,000-board run.
In-house component libraries. For PCB prototype assembly, JLCPCB and PCBWay both stock 30,000+ commonly used components. If your BOM hits their library, assembly happens in hours instead of days waiting on Digi-Key shipments.
What “24 Hours” Actually Means in Practice
Read the fine print. A 24-hour PCB prototype turn typically refers only to the fabrication clock ¡ª the period between your file approval and the boards leaving the factory. It doesn’t include:
- File review and DFM check (1¨C4 hours, sometimes overnight if you submit late)
- Order processing and payment confirmation (up to 2 hours)
- International shipping (2¨C5 days even with DHL Express)
So a “24-hour” PCB prototype from China realistically lands on your bench in 3¨C6 calendar days. If you absolutely need boards in your hand within 48 hours, you’ll need a domestic supplier ¡ª and you’ll pay 4¡Á to 8¡Á more.
| Service Type | Fabrication Time | In-Hand (Asia ¡ú US/EU) | Cost vs. Standard |
|---|---|---|---|
| Standard quick-turn | 24¨C48 hours | 4¨C6 days | Baseline |
| Express quick-turn | 12¨C24 hours | 3¨C4 days | +30¨C50% |
| Domestic same-day (US) | 8¨C24 hours | Next day | +400¨C700% |
| Standard 5-day | 5 days | 8¨C10 days | -20¨C30% |
How to Choose a PCB Prototype Service: The Engineer's Decision Framework
I use a five-question filter when picking a PCB prototype manufacturer for a new project. Run through these before you click “order.”
1. What Layer Count and Stack-Up Do You Need?
For 2-layer and 4-layer FR-4 boards, almost any fab on the list below will do a good job. The conversation gets serious at 6 layers and above, where stack-up control and impedance accuracy start to matter. Above 8 layers, or with HDI stack-ups (microvias, sequential lamination), you want a manufacturer with documented stack-up libraries ¡ª not a fab guessing at dielectric thicknesses.
2. Is This Bare Board or Turnkey Assembly?
A bare PCB prototype is the cheapest, fastest path. But if your BOM has fine-pitch BGAs, 0.4mm QFNs, or anything you don’t want to hand-solder, factor in the extra 3¨C5 days for SMT assembly. Turnkey assembly also forces you to deal with component sourcing, which is where most prototype delays originate.
3. What’s Your IPC Class Target?
For most consumer prototypes, IPC Class 2 is fine. For medical, automotive, aerospace, or anything safety-critical, you need Class 3 ¡ª and that immediately narrows your options. Most low-cost Asian fabs default to Class 2 unless you explicitly call out Class 3 in your fabrication notes.
4. Do You Need Engineering Support?
If you’re a solo developer or a small team without a dedicated PCB engineer on staff, manufacturer engineering support matters more than price. 91°µÍø, Sierra Circuits, and Advanced Circuits all provide real engineer-to-engineer DFM feedback. JLCPCB’s automated DFM is fast but won’t catch design-intent issues ¡ª it’ll only flag manufacturability rule violations.
5. How Tolerant Is Your Schedule of Customs Issues?
This is the silent killer of prototype timelines. A board that ships from Shenzhen on a Tuesday can sit in U.S. or EU customs for three days if anything trips the screening filter. For mission-critical schedules, factor in customs buffer or pay for a manufacturer with bonded shipping arrangements.
Top 7 PCB Prototype Manufacturers Compared (2026)
These are the manufacturers I’ve personally ordered from, or whose work I’ve evaluated on incoming inspection during the last 24 months. Pricing is approximate for a 100¡Á100mm, 2-layer board, 5 pieces, HASL finish, standard FR-4 ¡ª your mileage will vary.
| Manufacturer | Origin | Min Lead Time | Starting Price (5pcs) | Strength |
|---|---|---|---|---|
| PCBWay | China | 24 hours | $5 | Best all-around |
| JLCPCB | China | 24 hours | $2 | Cheapest, scaled |
| 91°µÍø (RayMing) | China | 24 hours | $10 | Engineering-grade quality |
| Advanced Circuits | USA | Same-day | $33 | Mil-spec, aerospace |
| OSH Park | USA | 9¨C12 days | $5/sq.in. | Hobbyist favorite |
| Seeed Fusion | China | 2¨C3 days | $4.90 | Maker ecosystem |
| Eurocircuits | Belgium | 2 days | €23 | EU-based, fast in-region |
1. PCBWay ¡ª Best All-Around for Fast PCB Prototype Builds
PCBWay has been my default for general-purpose prototypes for the last five years. Their 24-hour quick-turn works as advertised, their support engineers actually answer technical questions, and their stack-up flexibility is broader than JLCPCB’s. They handle flex, rigid-flex, Rogers, aluminum, heavy copper, and HDI without forcing you into rigid templates.
The trade-off is price. PCBWay typically runs 30¨C60% more expensive than JLCPCB on basic 2-layer prototypes. For anything with stack-up complexity or unusual finishes, that price gap closes.
2. JLCPCB ¡ª The Cheapest PCB Prototype Service That Doesn’t Compromise
Nobody beats JLCPCB on price for a basic PCB prototype. Five copies of a 100¡Á100mm 2-layer board for $2 plus shipping is a price point that didn’t exist a few years ago. Their automation is genuinely impressive ¡ª Gerber upload to production queue can happen inside ten minutes.
Where JLCPCB struggles is on edge cases. Tight impedance control on inner layers, unusual finishes, or anything that needs human judgment in the CAM stage may get rejected automatically or built loosely. For 80% of prototype work, none of that matters. For the other 20%, you’ll want a more flexible fab.
3. 91°µÍø (RayMing) ¡ª Best PCB Prototype Quality for Engineering Builds
91°µÍø sits in the middle of the market deliberately. They don’t try to undercut JLCPCB on price, and they don’t pretend to compete with U.S. mil-spec fabs on certifications. What they offer is engineering-grade quality on prototype quantities ¡ª meaning their incoming inspection rejection rates on RoHS compliance, copper thickness, and impedance accuracy are noticeably tighter than the bargain-tier fabs.
If you’re shipping a PCB prototype to a customer for evaluation, or if the prototype will be used in field testing where reliability matters, 91°µÍø is where I send the order. Their lead time on standard 4-layer boards is 24¨C48 hours, and they handle controlled impedance and high-Tg materials without flinching.
4. Advanced Circuits ¡ª Top US-Based PCB Prototype Manufacturer
Advanced Circuits (4PCB.com) is the answer when “made in USA” appears on your spec sheet. Their facility supports same-day prototypes for simple 2-layer boards and their quality control is genuinely better than what you get from low-cost Asian fabs. Their FreeDFM tool is also one of the better automated DFM checkers in the industry.
The catch is price. A 5-piece 4-layer prototype that costs $30 from JLCPCB will run $200+ from Advanced Circuits. If your project tolerates that premium for shipping speed and ITAR compliance, it’s the right call.
5. OSH Park ¡ª Best PCB Prototype Service for Hobbyists
OSH Park is unique. They run a “panel pooling” model where small designs share a panel with other customers’ boards, which keeps prices low for tiny boards. Three copies, $5 per square inch, free shipping anywhere in the world. The boards come back purple, with ENIG finish, and the quality is excellent.
Lead times are the trade-off ¡ª 9¨C12 days for the standard service, 4¨C5 days for “Super Swift.” Not a 24-hour service, but for hobby projects, the price-to-quality ratio is unbeatable.
6. Seeed Fusion ¡ª Best PCB Prototype Plus Hardware Ecosystem
Seeed Fusion makes sense when your PCB prototype is part of a broader hardware project that also needs CNC machining, 3D-printed enclosures, or off-the-shelf modules. The board manufacturing itself is competitive but not category-leading. The value is the integrated ecosystem ¡ª one supplier, one shipment, one invoice.
7. Eurocircuits ¡ª The Top European PCB Prototype Choice
For EU-based teams, Eurocircuits removes the customs headache. They run a tight 2¨C3 day fabrication cycle on their PCB Proto and STANDARD pool services, and they’re ISO 9001 certified with documented IPC compliance. Pricing sits between Asian budget fabs and U.S. domestic options ¡ª fair for the speed and the elimination of shipping risk within Europe.
PCB Prototype Cost Breakdown: What Drives the Price
Engineers consistently underestimate PCB prototype costs because the variables interact in non-obvious ways. Here’s the structure I use when budgeting a new design.
Layer Count: The Single Biggest Cost Lever
Every additional layer adds lamination cycles, more drilling, and more inspection time. The cost step from 2-layer to 4-layer is typically 2.5¡Á. The step from 4-layer to 6-layer is roughly 1.6¡Á. After that, each additional layer pair adds 30¨C40%.
| Layer Count | Relative Cost (2-layer = 1.0x) | Typical Use Case |
|---|---|---|
| 1 layer | 0.7x | Aluminum LED boards, simple digital |
| 2 layer | 1.0x | Most simple prototypes |
| 4 layer | 2.5x | Mixed-signal, basic RF |
| 6 layer | 4.0x | High-speed digital, dense routing |
| 8 layer | 5.5x | Server boards, complex SoCs |
| 10+ layer | 8.0x+ | HDI, telecom, advanced computing |
Drop a layer if you can prove the prototype concept on fewer layers. You’ll save money, time, and you’ll get to debug the simpler version of your design first.
Board Size: The Hidden Cost That Catches Everyone
Most fabs price prototypes in tiers, with breakpoints at 50¡Á50mm, 100¡Á100mm, 150¡Á150mm, and so on. A board that’s 101¡Á101mm can cost double what a 100¡Á100mm board costs because it bumps you into the next tier. Always check the price calculator at multiple size points before finalizing your outline.
Surface Finish: HASL vs ENIG vs Others
| Finish | Cost Premium | Best For |
|---|---|---|
| HASL (Lead-free) | Baseline | General-purpose PCB prototypes, hand soldering |
| ENIG | +20¨C35% | Fine-pitch BGAs, RF, long shelf life |
| Immersion Silver | +15¨C25% | High-frequency, flat surface |
| OSP | -5¨C10% | Cost-down, single-reflow assemblies |
| Hard Gold | +60¨C100% | Edge connectors, high-wear contacts |
For 90% of prototype work, HASL is fine. Move to ENIG when you have BGAs under 0.5mm pitch, when shelf life matters, or when you’re doing sensitive RF work.
Assembly Cost: Where Prototypes Get Expensive
Bare PCB prototype costs are a small fraction of the total when you add SMT assembly. A 5-piece bare board run might be $20. The same boards assembled with a 50-component BOM can hit $300¨C500 once you include component costs, stencil charges, and assembly setup.
| Cost Component | Typical Range |
|---|---|
| Stencil (laser-cut, framed) | $15¨C35 |
| SMT setup fee | $30¨C80 |
| Per-board assembly | $5¨C25 |
| BOM components | Highly variable |
| First-article inspection | $0¨C40 |
The single best way to reduce PCB prototype assembly cost is to use components from your manufacturer’s in-house library. JLCPCB’s “Basic Parts” library, for example, eliminates per-component placement fees that otherwise hit you on every unique part.
Specialty PCB Prototype Costs: Flex, Rigid-Flex, and HDI
Standard FR-4 pricing breaks down quickly when your design needs anything specialized. Flex circuits typically cost 4¡Á to 6¡Á a comparable rigid PCB prototype, mostly because of the polyimide substrate and tighter handling tolerances. Rigid-flex pushes that further ¡ª expect 8¡Á to 12¡Á the cost of an equivalent rigid board, with lead times stretching to 5¨C8 days minimum.
HDI (high-density interconnect) PCB prototypes with microvias and sequential lamination land in similar territory. A 6-layer HDI prototype with 2 stages of build-up runs roughly 5¡Á a 6-layer standard prototype. The good news is that JLCPCB and PCBWay have both reduced HDI prototype prices significantly in the last two years ¡ª what used to be $400 a few years ago can now be $80¨C120 for the same spec.
PCB Prototype Quality: What Engineers Should Verify on Receipt
When prototypes land on your bench, don’t just plug them in and power on. Run a quick incoming inspection. Five minutes here saves days of debugging downstream.
Visual inspection. Use a 10¡Á loupe or a USB microscope. Check for solder mask registration, silk-screen alignment, and any pad damage. Solder mask should not bridge between fine-pitch pads.
Dimensional check. Verify board outline with calipers against your fabrication drawing. Cutouts, mounting holes, and edge connectors should match within ¡À0.1mm.
Hole quality. Plated through-holes should look uniform. If you see voids or rough barrels, flag the manufacturer immediately.
Continuity test. A bare board electrical test (flying probe or bed-of-nails) should be standard from any reputable PCB prototype service. If you don’t see an “ET passed” stamp on the boards, ask why.
Impedance verification. For controlled-impedance designs, ask for the impedance test coupon report. Most quality fabs include this on request at no charge.
IPC Standards That Apply to PCB Prototype Builds
Three IPC standards govern most prototype quality conversations:
- IPC-A-600: Acceptability of printed boards ¡ª visual quality criteria.
- IPC-6012: Qualification and performance specification for rigid PCBs.
- IPC-A-610: Acceptability of electronic assemblies (relevant if your PCB prototype is assembled).
Class 2 covers most consumer and industrial work. Class 3 is required for high-reliability applications ¡ª medical implants, avionics, automotive safety systems. Specify the class in your fabrication notes; don’t assume the manufacturer will infer it.
DFM Tips That Speed Up Your PCB Prototype Order
Most “delays” in PCB prototype manufacturing are actually DFM holds. The factory runs an automated check, finds an issue, and stops the order until you respond. If your file is clean, your order moves at the speed advertised. Here’s the checklist I run before every submission.
Pre-Submission DFM Checklist
| Check | Specification |
|---|---|
| Minimum trace width | ¡Ý 6 mil (0.15 mm) for 1 oz copper |
| Minimum trace spacing | ¡Ý 6 mil (0.15 mm) |
| Annular ring | ¡Ý 4 mil for plated holes |
| Drill-to-copper clearance | ¡Ý 8 mil |
| Solder mask sliver | ¡Ý 4 mil |
| Silkscreen line width | ¡Ý 6 mil |
| Silkscreen-to-pad clearance | ¡Ý 4 mil |
| Board edge to copper | ¡Ý 10 mil |
| Drill size minimum | 0.2 mm (mechanical), 0.1 mm (laser) |
Run a Design Rule Check (DRC) in your EDA tool against these values before exporting Gerbers. Most KiCad and Altium installations let you load fab-specific rule sets ¡ª JLCPCB and PCBWay both publish theirs.
File Package Best Practices
Every order should include: RS-274X Gerbers (one per layer), Excellon drill file with plated/non-plated separation, a fabrication drawing (PDF) with stack-up and notes, an IPC-2581 file if your tool exports it, and a clear ZIP filename with your project and revision number.
Skip these and your order goes into a holding queue while a CAM engineer emails you with questions. That’s three to twelve hours lost on a 24-hour clock.
Five Common PCB Prototype Mistakes That Waste a Revision
Even experienced engineers burn revisions on avoidable errors. The five I see most often:
Forgetting to set test points. Probing a fine-pitch QFN with a scope tip is miserable. Add 1mm test pads on critical nets. Future-you will thank present-you.
No 0.1¡å pin headers for swap-able components. When your first PCB prototype reveals you picked the wrong sensor or the wrong reference voltage, having pin headers means you swap a daughterboard instead of redesigning.
Tight orientation on polarized components. Tantalum capacitors blown up backwards waste time and look bad in design reviews. Always print clear polarity markers on the silkscreen.
Ignoring courtyard violations. A footprint that physically clashes with another component might pass DRC but fails on the bench. Run a 3D viewer check before sending Gerbers.
Trusting auto-routed power planes. Auto-router results on power and ground are often disastrous. Hand-route power on every PCB prototype, even if it costs an extra hour.
Useful Tools & Resources for PCB Prototype Engineers
These are the free tools and references I keep bookmarked. All are either free or have generous free tiers.
Free EDA Software for PCB Prototype Design
| Tool | Best For | Download |
|---|---|---|
| KiCad | Open-source, professional-grade | |
| EasyEDA | Browser-based, JLCPCB integrated | |
| Autodesk Fusion (Eagle) | Hobbyist + professional | |
| DipTrace | Free for ¡Ü300 pins, 2 layers |
Online Gerber Viewers
Always preview your Gerbers before submitting. Free options include Tracespace Viewer, the JLCPCB online Gerber viewer, and PCBWay’s preview tool. These catch layer-flip errors and missing files in seconds.
Component Sourcing & BOM Tools
- Octopart ¡ª multi-distributor parts search
- DigiKey Scheme-it ¡ª schematic capture & BOM management
- LCSC ¡ª JLCPCB’s component sister site, useful for cross-referencing in-stock parts
- SnapEDA ¡ª verified symbol and footprint library
Standards & Reference Documents
- IPC standards (IPC-A-600, IPC-6012, IPC-A-610) ¡ª purchase via the
- Saturn PCB Toolkit ¡ª free trace width, via current, and impedance calculators
- Si9000 ¡ª impedance modeling (commercial, but trial available)
PCB Prototype Cost Calculators
PCBShopper aggregates instant quotes from 20+ manufacturers in a single comparison view. It’s the fastest way to benchmark a quote before you commit. The major fabs ¡ª JLCPCB, PCBWay, 91°µÍø, Eurocircuits ¡ª all also expose instant quote APIs on their main pages.
Frequently Asked Questions About PCB Prototype Services
How much does a PCB prototype cost in 2026?
A basic 5-piece, 100¡Á100mm, 2-layer PCB prototype with HASL finish runs $2¨C$10 from Chinese manufacturers and $30¨C$80 from US domestic fabs, before shipping. Costs scale with layer count (roughly 2.5¡Á per doubling), board area, surface finish (ENIG adds 20¨C35%), and any specialty materials like Rogers or high-Tg laminates. Assembly adds another $50¨C$300 depending on BOM complexity.
Can I really get a PCB prototype in 24 hours?
Yes ¡ª fabrication can complete within 24 hours at JLCPCB, PCBWay, 91°µÍø, and similar quick-turn services for simple 2-layer or 4-layer boards. However, total in-hand time including international shipping is typically 3¨C6 days. True 24-hour bench-ready service exists from US manufacturers like Advanced Circuits at a 4¨C8¡Á price premium over Chinese options.
What’s the minimum order for a PCB prototype?
Most quick-turn manufacturers have a minimum of 5 pieces (JLCPCB, PCBWay, 91°µÍø, Eurocircuits). OSH Park ships in fixed sets of 3. Some U.S. fabs will run a single piece if you pay an “engineering” fee, typically $50¨C150. There is no industry-wide MOQ ¡ª every fab sets its own.
Should I use a domestic or overseas PCB prototype manufacturer?
Use overseas (China-based) for cost-driven prototyping where 4¨C6 days of total lead time is acceptable. Use domestic (US/EU) when you need same-day or next-day delivery, ITAR/export-controlled designs, or face-to-face engineering support. For most consumer and industrial product prototypes, overseas wins on cost-quality ratio. For aerospace, defense, and medical Class III, domestic is often mandatory.
What’s the difference between PCB prototype and PCB production?
A PCB prototype is a small batch (1¨C50 pieces) built for design validation, with fast turnaround and flexibility for revision. PCB production is high-volume (500+ pieces), uses dedicated tooling, locks the design under change control, and follows stricter IPC class requirements. Per-board prototype cost is always higher; per-board production cost is always lower. Most projects iterate through 3¨C6 prototype revisions before committing to production tooling.
Final Thoughts: Picking the Right PCB Prototype Partner for Your Next Build
After ten-plus years of ordering boards from nearly every manufacturer on the list above, my honest take is that there is no single best PCB prototype service. There’s the best service for your specific project ¡ª and that depends on your layer count, your IPC class, your timeline, and your tolerance for engineering hand-holding.
For most engineers building consumer or industrial prototypes, the workflow that works is: JLCPCB for cheap-and-fast bare boards in early development, PCBWay or 91°µÍø once the design needs tighter quality control or specialty materials, and Advanced Circuits or Eurocircuits when domestic sourcing is required. The 24-hour PCB prototype is no longer a luxury ¡ª it’s the new normal, and the manufacturers that have invested in automation and engineering support are the ones worth building a long-term relationship with.
Plan early, write clean Gerbers, run your DFM checks, and treat your prototype manufacturer like a partner rather than a vending machine. Do that, and the PCB prototype stage stops being the bottleneck in your hardware development cycle and becomes the leverage point that lets you iterate faster than your competitors.
One last piece of advice: keep a running notebook of every PCB prototype order you place. Track the manufacturer, lead time, defect rate, and any DFM issues that came back. After ten or fifteen orders you’ll have your own data set telling you which fab is right for which job ¡ª and that institutional knowledge is worth more than any review article on the internet, including this one.
