Tips for Designing for Manufacturability

3 PCB Layout Tricks That Instantly Improve Manufacturability I've reviewed many PCB designs and keep seeing the same manufacturability issues that put projects at risk and increase costs. Here are 3 simple DFM-specific layout tricks you can implement TODAY that will dramatically improve your board's manufacturability (this one of many things that job descriptions mean when they refer to 'design for yield' or 'DFx' in a PCB design role): 1. The "Teardrop" Technique for Via Reliability Ever had a PCB manufacturer call you about possible breakout issues? Without teardrops, even having enough annular ring on your copper pads might not be enough to avoid breakout. Also, without tear drops, mechanical stress can cause the copper connection between a via and trace to fracture, especially with fine traces (below 6 mils). The simple fix: Add teardrops to via-to-trace connections on high-current paths and mechanically stressed areas - or just in general. Looks nicer, too. This increases the copper area at the junction by 30-40%, improving durability during thermal cycling and reducing drill breakout risk. PRO TIP: Most PCB software has this built-in, but few engineers consistently apply it on newer boards. 2. The "Edge Spacing" Rule for Better Yields Many new designers place components too close to the board edge, creating problems during depanelization. But they of course wouldn't know. It's inside standards and not necessarily an obvious thing to know or guess. The simple fix: Create an "Edge Spacing" design rule: - Components: Minimum 2mm from board edge - Vias: Minimum 1mm from board edge - Traces: 0.5mm from board edge (1mm for power) This prevents damage during board separation and reduces manufacturing costs. PRO TIP: Set this as a permanent design rule in your template for all future boards. 3. The "Soldermask Web" for Fine-Pitch Components With fine-pitch components (0.5mm pitch or less), standard soldermask configurations can bridge between pads. The simple fix: Implement a "soldermask web" rule for minimum soldermask web widths between pads. When soldermask opening is too large, the web becomes too thin, creating solder mask slivers and solder bridges. PRO TIP: Many manufacturers handle soldermask expansion automatically so your expansion can usually be 0 or none. Follow their specifications when available. Otherwise, for components with 0.5mm pitch or less, ensure your soldermask web is at least 0.1mm wide. None of these techniques require fancy software or advanced knowledge. They're simple rules you can implement in ANY PCB design tool for DFx. Note this: A perfect circuit design that can't be reliably manufactured is ultimately useless. #PCBDesign #DFM #HardwareEngineering #ManufacturabilityTips

Many mechanical designs work in CAD and even in prototypes, but fail across production volumes over time. The reason is variation. Real manufacturing processes shift over time, and many designs fall short of proper accounting for that from the beginning. A common pattern: -Engineers design with tight tolerances early -Stackups are checked with statistical methods -Worst-case assembly limits are never evaluated So when the process shifts, the assembly runs out of tolerance room. The typical reaction is to tighten component tolerances, which increases cost but still doesn’t address the real issue. A better approach: -Start with a top-down assembly tolerance budget strategy -Design using worst-case tolerances to ensure fit and function -Establish tolerance reciprocity between components within that budget -Only after those relationships are understood, tighten component tolerances on drawings to control manufacturing variation 👉Because the real challenge in production is not nominal design. 💡It’s variation across production volumes over time. #mechanicalengineering #mechanicaldesign #manufacturing #machining #cnc #cncmachining #DFSS #designformassproduction #massproduction #productdevelopment #productdesign #mechanismdesign #mechanismengineering #mechatronics #GDT #GDandT #geometricdimensioningandtolerancing #stackups #tolerancestacks #engineeringanalysis #manufacturingvaritation #metrology

Design for Manufacturing (DFM) and Design for Assembly (DFA) aren't constraints. They're competitive advantages. Here's what 5 years in industrial equipment design taught me: DFM mindset: Use standard materials and stock sizes Design for existing manufacturing processes Minimize tight tolerances (unless critical) Consider tool access for machining DFA mindset: Reduce part count where possible Design for top-down assembly Use self-locating features Standardize fasteners across the design When I redesigned legacy conveyor components with these principles, we cut assembly time by 30% and reduced BOM complexity significantly. The best part? Manufacturing teams started coming to me with FEWER questions and MORE solutions. Engineering isn't just about innovation. It's about practical innovation that makes everyone's job easier. #DFM #DFA #ProductDesign #LeanManufacturing #MechanicalDesign

We’ve built for GoPro, Walmart, and 100s of hardware startups. Here are 8 mistakes I see $1.5M-funded founders repeat in pre-production: 1. If it can’t be quoted, it can’t be built. I’ve seen so many smooth prototypes that look great but aren’t designed for manufacturability. Then factories either ghost or quote 4x. Why? Undercuts and part geometry made tooling impossible. If your design isn’t quoting cleanly, it’s not a product yet. 2. BOM isn’t a budget - it’s a liability list. One team’s $38 BOM ballooned to $62 after sourcing revealed single-vendor parts and fragile components. Your BOM should protect your margin, not drain it. 3. Never tool before your tolerances are tested. A wearable team tooled early - then found a 12% failure rate in production. Tooling before DFM is just a bet you can’t afford to lose. 4. What works at 50 units fails at 5,000. We’ve seen battery doors crack, enclosures warp, and boards overheat - because the product was only tested at lab scale. CAD hides stress. Volume exposes it. 5. Design firms often don’t speak “factory.” A sleek prototype arrived with no draft angles, wall thickness issues, and unusable files. If they’ve never shipped 10,000 units, don’t trust them to design yours. 6. Getting one quote isn’t success - it’s a trap. One startup was quoted 35% above target and had no backup. We redesigned 3 parts and unlocked 5 new factories. No quote = no leverage = no plan B. 7. BOM rejection is where the bleeding starts. One team sent their BOM after raising $2.1M. 6 of 18 parts failed compliance or sourcing. If your BOM hasn’t been factory-reviewed, your roadmap is fiction. 8. Prototypes don’t prove scalability. DFM does. One team built a slick demo using CNC-machined parts. The clip-on enclosure fit perfectly. Everyone loved it. But when we prepped it for mass production, we found: - No draft angles for molding - Undercuts that required complex, expensive tooling - Assembly steps that added labor cost at scale It was never designed to be built at volume. What worked in a demo couldn’t be molded, tooled, or quoted. Prototypes can prove function. But only DFM proves you’re ready to scale. If you’re in pre-production with real capital at stake, DFM is your insurance policy. DM or comment “DFM” for the checklist, that’s saved founders six figures in mistakes (minimum).

"Short Shots in Ribs" Ribs are used to add stiffness and strength to plastic parts without significantly increasing their weight or material usage. However, the presence of ribs can also introduce manufacturing challenges, such as short shots. Several factors contribute to this issue, particularly rib height, polymer material, and process conditions. Rib Height The height of the rib in a part design is a critical factor that can lead to short shots. Taller ribs can make it difficult for the molten plastic to flow to the end of the mold cavity, especially if the flow path is long and thin. The molten plastic cools and solidifies as it moves through the mold, and if the ribs are too tall, it may solidify before filling the cavity. This problem is exacerbated in designs with multiple tall ribs or ribs that are closely spaced, as they can restrict the flow of plastic and increase the likelihood of premature cooling and solidification. Polymer Material The type of polymer material used in the injection molding process also significantly impacts the occurrence of short shots. Different materials have different flow characteristics, influenced by their viscosity, melting temperature, and thermal conductivity. Materials with higher viscosity or lower thermal conductivity may not flow as easily into thin or intricate sections of the mold, such as tall ribs. Process Conditions Process conditions, including injection speed, pressure, temperature, and cooling time, are paramount in determining the quality of the molded part and the likelihood of short shots. Insufficient injection pressure or speed can result in inadequate filling of the mold, particularly in areas with complex geometries or thin features like ribs. Similarly, the melt temperature and the mold temperature need to be optimized to ensure the material remains fluid enough to fill the mold before solidifying. To mitigate the risk of short shots, engineers and designers must carefully consider these factors during the part design and molding process setup. Design adjustments, such as reducing rib height, altering rib placement, or adding gates and runners to improve material flow, can be effective. Choosing a material with suitable flow characteristics for the part's design and optimizing process conditions for that material can also greatly reduce the occurrence of short shots. Moreover, simulation software is often used in the design phase to predict flow patterns and identify potential short-shot issues before manufacturing begins, allowing for preemptive adjustments to the design or process parameters. #injectionmolding, #plasticsindustry, #moldmaking, #molding, #moldingdefects #plasticinjectionmolding, #plastics, #plasticsengineering, #molddesign, #partdesign, #moldex3d, #Spritzguss, #plastics, #plasticinjectionmolding, #plasticsengineering, #partdesign #arburg,#kunststofftechnik #kunststoffe ,#seminar, #kunststoffindustrie, #polymers,#moldmaking

The hidden craft behind BIW engineering. Every time I work on BIW structures, I am reminded how much silent complexity sits behind what people call design efficiency. Companies talk about efficiency as if it is a simple formula. Deliver high quality, fast, at low cost. In mass production this is the dream, and sometimes the only way a business continues to grow. But when you translate that into the world of BIW, it becomes a much richer conversation. Efficiency means balancing engineering fundamentals with manufacturability, vehicle performance, styling intent and customer experience. Those three words: time, quality and cost, are supported by a long chain of decisions that are rarely visible to anyone outside the engineering teams. When I wrote my handbook on BIW structures, I highlighted the real workload behind these decisions. Regulatory standards. Internal performance targets. Expectations from customers. Packaging and ergonomic needs. Styling and craftsmanship. Durability. Reliability. NVH and overall vehicle dynamics. Assembly and manufacturing feasibility. Weight targets and cost pressures. Interfaces with dozens of other systems that depend on the body to function. This is where the craft of BIW engineering lives. You might change a cutout or shift a flange by a small amount, but in reality you are negotiating between stamping constraints, welding access, strength requirements, part appearance, corrosion protection, sealing potential and downstream assembly processes. What looks like a simple CAD tweak can disrupt tooling, fixtures, gauges or joining sequences if you do not have a deep understanding of how the system behaves. Beyond these daily constraints, we also think far ahead. Serviceability, repairability, maintenance and warranty exposure over ten years or more. Different climates, road conditions and customer usage patterns. All of this must be considered before a single tool is cut. And underneath everything, the Body Structure still needs to deliver its fundamental functions. It must define the shape and appearance of the vehicle. It must provide installation locations for subsystems. It must protect occupants and components from the environment. It must manage energy during crash events with precision. Whether the architecture uses steel, aluminum or a mix, each of these needs represents a stream of tasks and interfaces that require judgement, intuition and experience. This is why I always say that advanced tools are powerful, but the results depend on the people behind them. A simulation can tell you how a panel behaves, but not why a small design choice will compromise craftsmanship or cause complexity during manufacturing. Only hands-on understanding gives you that sense. Share your insight. What does efficiency mean in your world? Daniel Perez #automotive #engineering #manufacturing #design

I regularly get emails from startups with grand ambitions but no real budget for design services. The pitch is always the same. I have this concept, and just need it modeled up quick so I can print it. "just" is the key word. Just a quick model. Just a quick print. Just a quick design change. Just. Just. Just. There is a lot of information that goes into a design, and it's so much more than 'just a CAD model'. Here's just a few things that we think about when designing products: Manufacturing Method A CAD model with no manufacturing intent is just a model. 3D printing is type of manufacturing method, that needs to be considered when designing parts. We design a lot of parts to be printable. But the intent of the design is not for production. Features are optimized for printing. Manufacturing Cost A design that can't be made for a profit is (generally speaking) not a good design. Designing with cost in mind for each part, helps ensure that there are no surprises when a design gets to manufacturing. We regularly get cost quotes on our preliminary concept models. Create a part with 'expected' complexity, not final geometry. This part allows us to quickly ballpark our BOM cost for the entire assembly. Manufacturing Tolerances Some designs only work with tight tolerances, and fail when made with 'typical' tolerances. Knowing what Manufacturing Tolerances are achievable with which Manufacturing Method is part of the design task. The tolerances are well published, but many early designers/engineers don't think about this early enough. They get too far down a design without considering what tolerances will be necessary to achieve their functionality. Design for Testing (Early) Many concepts need early testing. Maybe it's ingress/waterproofing or RF/EMF testing. Knowing that these tests need to pass, we can design surrogate parts/assemblies that stand in for the final design. We can short-circuit the later design cycle by testing/validating assumptions early in the design loop. These aspects need to be addressed for a successful launch, but many companies don't budget for them up front. I wonder if it's because the work product is invisible...? The part files might look the same to someone that doesn't understand nuances of injection molding. But one part is easily moldable and one is impossible. #dfm #design #3dprinting #manufacturing #engineering

If your CMF only works in a render, it doesn’t work at all. Most CMF failures aren’t aesthetic mistakes. They’re manufacturing realities designers chose not to engage with. CMF designers need to understand manufacturing (at least a little)... Not to become engineers. Not to read tool drawings. But to avoid designing surfaces that can’t survive reality. CMF doesn’t live on a moodboard. It lives in a mold. And when CMF designers avoid manufacturing fundamentals, the problem isn’t that the surface isn’t perfect. The problem is that it falls apart. • surfaces read inconsistently • finishes feel cheaper than intended • effects behave differently on the same part By the time anyone notices, the tool is cut. The budget is gone. And CMF is blamed. I learned this the hard way working in CMF and later in Design Quality. And honestly, I’m still learning. Here are a few lessons I’ve learned that I believe every CMF designer should understand early on: 1. TOOL DIRECTION CHANGES PERCEPTION Tool direction controls material flow. Material flow controls how light moves. Ignore it and: • gloss looks uneven • pearlescence concentrates or disappears • textures stretch, compress, or collapse // The surface may be correct on paper and wrong to the eye. 2. MOLD GLOSS SETS THE EMOTIONAL BASELINE Paint, coating, foil - none of them start from zero. Mold polish already defines: • sharpness • softness • depth // If mold gloss contradicts CMF intent, no layer on top will save it. 3. TEXTURES IS NEVER NEUTRAL A flat plaque is not reality. On real parts: • textures stretch on draft • compress on radii • amplify noise on large areas // Without manufacturing awareness, texture choice is a gamble. 4. EFFECTS DON'T FORGIVE Metallics and pearlescents don’t hide issues. They expose them. They make: • tool marks visible • draft changes obvious • inconsistencies impossible to ignore // That’s why effects should come last, after the base surface already works. Understanding manufacturing doesn’t limit creativity. It protects it. Because great CMF isn’t what survives approval. It’s what survives tooling, production, and real life. Anything else is just a render. #CMFDesign #SurfaceDesign #DesignQuality #IndustrialDesign #ProductDevelopment #MaterialBehavior

Many engineering failures do not come from bad designs — they come from bad tolerancing. On the left side of the image, the dimensions are defined only by ± tolerances. On paper, everything looks acceptable. In reality, this approach creates ambiguity for manufacturing, inspection, and assembly. On the right side, the same part is defined using functional tolerancing and GD&T: * Size is controlled where size actually matters * Geometry is controlled relative to datums (A, B, C) * Positional tolerance ensures assembly fit, alignment, and repeatability * Maximum Material Condition (MMC) allows **manufacturing flexibility without sacrificing function Why this matters in real life: * Assemblies fit the first time, not after rework * Scrap and inspection disputes are reduced * Suppliers understand design intent, not just numbers * Cost goes down while reliability goes up Tolerancing is not about tightening dimensions. It is about controlling function. If you are still dimensioning parts without thinking about datums, function, and variation — you are designing drawings, not products. #MechanicalEngineering #GDnT #DesignForManufacturing #EngineeringDesign #ToleranceStackUp #ManufacturingReality

Customers often ask me how engineers and manufacturers can work together to minimize errors and delays, and the answer is surprisingly simple: Bring manufacturing into the design process early. A huge percentage of manufacturing issues can be avoided by designing for manufacturability (DFM) from the start instead of fixing problems later. When manufacturing knowledge is involved early, potential issues get flagged before bits get turned into atoms and become costly mistakes. When done correctly, this will lead to: —> Cheaper parts with optimized materials and processes —> Fewer revisions since manufacturability concerns are addressed upfront —> Faster production with designs that align with real-world fabrication constraints How can engineers involve manufacturing earlier? 1️⃣ Send initial design concepts for feedback before finalizing designs drawings. A quick review can prevent manufacturability headaches. 2️⃣ Ask about machining process achievable tolerances. This avoids over-engineering and unnecessary complexity. 3️⃣ Coordinate regular check-ins with manufacturing teams. Early collaboration leads to better decisions and fewer late-stage surprises. Quit waiting until the end of the design process to consider manufacturability, the best designs come from collaboration from day one. Engineering community—any tips and tricks for bringing DFM into your design process?