Free PCB DFM review · Design for manufacturability
Free PCB DFM Review: Find Issues Before Fabrication
Engineers check your Gerbers, drill data, stack-up and notes against the real tolerances of the line that will build your board, then return a written report within 24–48 hours.
- Checks per design
- 50+
- Report turnaround
- 24–48 h
- No obligation
- Free
- Annotated report
What a DFM review checks
Engineering review, not an automated pass/fail.
A PCB DFM (design for manufacturability) review checks design data against the fabrication line’s real capabilities and tolerances before production. It finds issues such as insufficient annular ring, drill-to-copper violations, solder mask slivers or unbuildable stack-ups while they are still cheap to fix.
Every AstroPCB order includes a free DFM review, and you can request one before ordering.
Checklist
What we check.
- Drill-to-copper clearance and annular ring for the drill class
- Minimum trace / space and acid traps
- Solder mask dams and slivers between fine-pitch pads
- Board-edge clearance for routing and V-score
- Blind, buried, stacked and filled via feasibility
- Copper balance for lamination flatness
- Impedance achievability on the proposed stack-up
- Silkscreen overlap and legibility
- Special features needing extra tooling
The report
Clear findings you can act on.
| Severity | Meaning |
|---|---|
| Critical | Must be resolved before fabrication can proceed |
| Advisory | Recommended change; can be accepted at the designer’s discretion |
| Informational | Construction choices we will apply, e.g. etch compensation |
How DFM feedback is communicated
How DFM feedback is communicated.
Each finding in the DFM report gives its location (layer, coordinates or reference designator), a description of the issue, the manufacturing risk and a recommended fix. Findings are graded as critical (must be resolved before fabrication), advisory (recommended but your call) or informational (construction choices we will apply, such as etch compensation or copper thieving). You approve the report before we release the job, so nothing changes silently.
DFM before you order
Request a DFM review before you order.
You don’t need to place an order to get a review. Send a design in progress, ideally once placement and stack-up are set but before routing is frozen, and we will flag issues while they are still cheap to fix. Early reviews are most valuable for HDI, rigid-flex and RF boards, where stack-up and via decisions drive most of the cost.
- Send once placement and stack-up are set
- Include intended materials and impedance targets
- Ask for an alternative construction quote if cost matters
Common findings
The most common DFM findings.
| Finding | Typical fix |
|---|---|
| Annular ring below class requirement | Enlarge pad or reduce drill |
| Solder mask sliver between fine-pitch pads | Gang-relief mask or adjust aperture |
| Acid trap / sharp copper angle | Fillet or re-route |
| Copper too close to board edge or V-score | Pull back copper ≥ 0.25–0.5 mm |
| Impedance not achievable on stack-up | Adjust width or dielectric |
| Unbalanced copper (warp risk) | Add thieving or rebalance layers |
Why it pays
What a DFM review saves.
A board re-spin usually costs a new set of boards, new stencils, new components for assembly and one to three weeks of schedule. Most re-spins caused by manufacturability, not by circuit design, are preventable: wrong annular ring, mask slivers, unbuildable via structures or impedance the stack-up cannot hit. A review before fabrication costs nothing and catches them on paper.
Inputs
What we need for a complete review.
| File | Why it matters |
|---|---|
| Gerber / ODB++ / IPC-2581 | Copper, mask, legend and outline geometry |
| Excellon drill + drill table | Hole sizes, plated vs non-plated, via spans |
| Fabrication drawing / README | Stack-up, material, finish, tolerances, IPC class |
| Impedance table | Targets, layers and reference planes |
| BOM + centroid (for DFA) | Package and pad checks for assembly |
Missing inputs are the most common reason a review takes longer. With a complete package we normally return findings within 24 hours, or 48 hours for complex HDI and rigid-flex.
Complex builds
Extra checks for HDI, rigid-flex and RF.
RF & high speed
Laminate availability, hybrid lamination, impedance and back-drill depth.
High frequency PCBFAQ
DFM review questions.
Is the DFM review really free?
Yes, with no obligation to order.
How long does a DFM review take?
Usually within 24 hours; complex designs (16+ layers, HDI, rigid-flex) up to 48 hours.
What do I need to send?
Gerber/ODB++/IPC-2581, drill files and a fabrication drawing or README with stack-up, material and impedance requirements.
Do you review assembly (DFA) too?
Yes, when you include BOM and centroid data — see PCB assembly.
Can I check files myself first?
Yes — use the Gerber viewer before uploading.
Can I get a DFM review without ordering?
Yes, a free review is available for designs in progress, with no obligation.
Ready when your files are
Get a free DFM review of your next board.
Upload Gerber, ODB++ or IPC-2581 data. Every quote includes a written engineering DFM review, typically within one business day.