# Design Is the Easy Part. Flux Is Built for the Rest. AI can design hardware. Building it is the hard part. Flux connects the design to live parts, manufacturer rules, fit checks, simulation, manufacturing quotes, and orders for the board and the mechanical parts. Written by [Matthias Wagner](https://www.flux.ai/natarius) Published Oct 2026 - 6 min read ![Design Is the Easy Part. Flux Is Built for the Rest.](https://www.flux.ai/p/assets/blogs/design-is-the-easy-part/main.webp) [Christian Keil](https://x.com/pronounced_kyle) wrote an essay this week with a title that every hardware engineer will understand: *Superhuman Hardware Design Is the Easy Part*. His argument is simple. AI models will soon design hardware very well. But the link between the digital world and the physical world is lossy. A design must still become parts that you can buy, files that a factory can build, and an assembly that fits together. Then the real world must tell you whether it works. We agree. We see it every day at Flux. A good design is the start of the work, not the end. We saw it first on our own team. As the Flux agent got better, designing a device became almost free. A board that took weeks took an afternoon. But the devices did not get to the bench faster. The time went to quotes, file checks, supplier emails, and order forms. Manufacturing became the friction. That is why we started to invest in manufacturable designs many years ago: live parts, manufacturer rules, and checks on every design. More recently, we started to invest in getting the devices manufactured. Today the Flux agent gets the quotes and places the orders for you. That is why Flux is not only a design model. Flux is the workspace where the design connects to everything after it: parts, factories, fit, and tests. The AI engineer in Flux designs the electronics and the mechanical parts of a device in one project, and it checks each design against the physical world before you order anything. ## Parts that you can buy, when you need them The essay tells a story from the first Falcon 1 launches. A test was delayed because one capacitor was in stock only at a store about 6,000 miles away. Every hardware team has its own version of this story. When Flux selects parts, it checks live pricing and stock at distributors such as Digi-Key, Mouser, LCSC, and Arrow. Mechanical hardware comes from suppliers such as McMaster-Carr and MISUMI. Flux reads the datasheet of every part and checks the design against its pinouts, ratings, and limits. The bill of materials stays current as the design changes. The result is a device that you can buy parts for today. ## Designs that your manufacturer can build A design that is ideal on screen can still be hard to make. Design for manufacturing is where the essay expects AI to struggle most, because it needs knowledge of real machines and real processes. In Flux, you define your layout rules and your manufacturer's capabilities once. Flux checks every design against them, every time. Electrical and manufacturing rule checks run on every schematic and board. When the design is ready, Flux gives you the files that your manufacturers need: Gerber, ODB++, IPC-2581, bill of materials, and pick-and-place for the board, and STEP, STL, or 3MF for the mechanical parts. Send them to fabricators such as JLCPCB, PCBWay, and SendCutSend. ## From quote to order A file that a factory can build is not yet a part in your hand. Somebody must get quotes, compare prices and lead times, place the order, answer the questions from the factory, and record the order. On most teams, that somebody is an engineer who should design the next device. The Flux agent does this work for you. Ask it what your device costs to make, and it gets manufacturing quotes for each part of the device: - **Circuit boards**: PCB fabrication and assembly, from manufacturers such as JLCPCB and PCBWay. - **3D-printed parts**: enclosures, brackets, and fixtures in resin, nylon, and metal. - **CNC-machined parts**: aluminum housings, heat sinks, and mounts. - **Injection-molded parts**: enclosures and covers in production volumes. - **Wiring harnesses**: the cables that connect the boards and the parts of the device. Flux reads the quantities, the board size, the layer count, and the materials from the project, so you do not fill in quote forms. The agent shows the quotes in one table, with the delivered cost and the lead time of each. Ask "What if we build 1,000 units?", and you get the new prices in the same chat. When you choose a quote, the agent places the order for you. It also follows the order. Ask "Where are my boards?", and the agent tells you the status. ### Your email and your PLM system, in the same loop Much of manufacturing happens in email. A board house asks about a drill size. A supplier sends a new lead time. A molder sends the report on the first parts. Connect your email to Flux, and the agent helps you manage these messages. It reads the question, finds the answer in the project, and writes the reply. The Flux agent also connects to your PLM system, for example Arena, and to the other systems that your company uses. The bill of materials, the revisions, and the released files in the PLM system stay the same as the design that you ordered. ## Parts that fit together Every part can meet its drawing, and the assembly can still fail. Tolerances stack. Teams that work in separate tools find the problem late, often when the first board does not fit in the first enclosure. In Flux, the board, the enclosure, the brackets, and the wiring harnesses between boards are in one project. The agent checks fit and clearance on the assembled parts before it exports them. A connector that moves on the board is checked against the opening in the enclosure in the same project, not in a meeting two weeks later. ![Hands tilt a green 3D-printed enclosure to show the circuit board inside](https://www.flux.ai/p/assets/blogs/design-is-the-easy-part/board-in-enclosure.webp) ## Simulate first, so the first build confirms The essay makes a point that we like a lot: with better simulation, the physical build can be *confirmatory, not experimental*. Atoms stay in the loop. But each trip to the lab should confirm a design, not discover what is wrong with it. Flux simulates and checks its own work before you build. It runs SPICE simulation of analog, power, and mixed-signal circuits, and full-wave electromagnetic simulation of the routed board. It runs thermal and airflow simulation of boards and enclosures, and finite-element stress analysis of brackets, enclosures, and mounts. The agent reads the results and changes the design. Problems show up on screen instead of on the bench. ## Process knowledge stays with your team The essay ends with process knowledge: the machinist who hears a problem in the CNC machine, and the engineer who knows why the last product failed in the field. This knowledge is rare, and it is usually in the heads of a few people. Flux lets your team write it down once. Design guidelines, preferred parts, manufacturer rules, and lessons learned become team knowledge. Every AI engineer in your organization applies them on every project. Past decisions stay with the project, so the next design starts from what your team already learned. ## Where this ends When AI makes design easy for everyone, the bottleneck moves from designing things to making them. More teams will build more devices, and each device must still survive the parts market, the factory, the assembly line, and the test bench. An AI that only designs is not enough for that world. Teams need an AI engineer that gets working hardware built, from the first idea to the order at the factory. That is what we build at Flux. **Describe the device you need. Flux designs the board and the mechanical parts, gets the quotes, and orders them.** ## About the author [Matthias Wagner](https://www.flux.ai/natarius) Founder & CEO at Flux Matthias is the Founder and CEO of Flux, a hardware design platform that's revolutionizing how teams create and iterate on circuits. Find him on Flux [@natarius](https://www.flux.ai/natarius). Let’s start building Build your big idea together with Flux. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. ![Close-up photo of a PCB made with Flux, with an ESP32 module, buttons, and a microSD slot.](https://www.flux.ai/p/assets/blogs/miscellaneous/sidebar-cta-pcb.webp) [Try it Free](https://www.flux.ai/signup) ## Related Content [ ![Flux simulation of the 2.45 GHz antenna feed of a real RF board: the electric field map above the top copper, and S11 and S21 from 0.5 to 4 GHz with S11 at -33.7 dB at 2.45 GHz](https://www.flux.ai/p/assets/blogs/em-simulation-of-your-routed-board/main.webp) ### Electromagnetic Simulation of Your Routed Board, From the Flux Chat 8 Min Read](https://www.flux.ai/p/blog/em-simulation-of-your-routed-board)[ ![The Mini Muse in the Flux 3D View with X-Ray materials: the enclosure and the display, boards, wiring harness, and speaker inside it](https://www.flux.ai/p/assets/blogs/3d-view-collaborative-mcad/main.webp) ### Stop Sending STEP Files: Build the Whole Device Together, Live, in Flux 6 Min Read](https://www.flux.ai/p/blog/3d-view-collaborative-mcad)[ ![Diagram of Flux Adaptive: the Flux agent sends hard design decisions to frontier models and routine work to fast, low-cost models, and runs independent tasks at the same time](https://www.flux.ai/p/assets/blogs/adaptive-agent-model/main.webp) ### Flux Adaptive: Frontier Performance at 30% Lower Cost 4 Min Read](https://www.flux.ai/p/blog/adaptive-agent-model)[ ![Work in progress in Flux: the main board of a smart thermostat is captured in the block diagram, while a side thread reviews the electrical design and Flux coordinates the tasks](https://www.flux.ai/p/assets/blogs/agent-teams-across-projects/main.webp) ### Flux Agents Work as a Team: Side Threads, Parallel Work, and Agents in Other Projects 5 Min Read](https://www.flux.ai/p/blog/agent-teams-across-projects)[ ![A wall of logos for services that the Flux agent can use with your API keys: Digi-Key, Mouser, Arrow, JLCPCB, PCBWay, Craftcloud, Shapeways, Golioth, Particle, nRF Cloud, Edge Impulse, Arena, OpenBOM, Duro, Octopart, SiliconExpert, NI SystemLink, and SimScale](https://www.flux.ai/p/assets/blogs/agent-secrets-any-web-api/main.webp) ### Your API Keys, Used Safely: How the Flux Agent Reaches Distributors, Manufacturers, and Any Web API 3 Min Read](https://www.flux.ai/p/blog/agent-secrets-any-web-api)[ ![The Flux chat composer with Chat mode selected and the tooltip "Chat: Faster, and free to use"](https://www.flux.ai/p/assets/blogs/flux-chat-free-ask-plan-spec/main.webp) ### Flux Chat: Ask, Plan, and Spec Your Device for Free 2 Min Read](https://www.flux.ai/p/blog/flux-chat-free-ask-plan-spec) See All (6) ## Let’s start building. Let’s build your idea together. All you need to do is describe what you want to make, or what problem you want to solve. Flux will work with you to make it a reality. [Try it Free](https://www.flux.ai/signup) ![Close-up of a Flux-designed printed circuit board](https://www.flux.ai/p/assets/homepage-v2/mission-visual.webp)