# Top 9 Most Asked Questions in Flux Troubleshoot common Flux AI PCB design issues with copper fills, libraries, imports, Auto-Layout, and Copilot wiring. Written by [Ryan Fitzgerald](https://flux.seobdtools.com/ryanf) Published Nov 2026 - 7 min read [![Graphic showing a red printed circuit board design with a list of common asked questions in Flux, such as overlapping copper and missing footprints. Based on the most common questions we hear from our users, it walks through practical solutions to unblock your designs and give you more confidence as you build.](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/main.webp)](#) ## Flux.ai: Your go-to guide for solving common design blockers. Flux is built to help you move fast—from idea to fully routed board—with powerful automation, AI-assisted design, and intuitive tools that make professional workflows accessible to everyone. But even the best tools come with a learning curve, and occasionally you might run into something unexpected. This guide is here to help. Based on the most common questions we hear from our users, it walks through practical solutions to unblock your designs and give you more confidence as you build. Whether you’re new to PCB design or just new to Flux, these tips are designed to save you time and help you get the most out of the platform. ### 1\. Overlapping Copper Errors **“Why am I seeing DRCs for overlapping copper?”** [![](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/overlapping-copper.webp)](#) Overlapping copper errors typically occur when copper from two different nets occupies the same area on a PCB layer. This can lead to short circuits, unexpected connections, and compromised board performance. Flux flags these cases as design rule check (DRC) violations to protect the electrical integrity of your design. #### How to resolve it: - Head to the [Review tab](https://docs.flux.ai/reference/flux-agent) in the top-right corner of your screen. - Scroll through the DRC list and select the overlapping copper entry. - Clicking on the entry will **highlight the problematic geometry**. - From here, you can **move, resize, or delete** copper elements to remove the overlap. > Tip💡: Enable all layers in your visibility settings. Overlaps sometimes occur between nets on different layers and can be easy to miss. ### 2\. Multiple Fills on a Single Layer **“Why is Flux saying I have conflicting fills?”** Flux automatically adds [GND fills](https://docs.flux.ai/reference/reference-ground-fills) to each layer, but if more than one net is assigned a fill on the same layer, it creates a conflict. The system prevents this to ensure clean and predictable copper behavior. #### Common causes include: - Importing a module that uses a different stackup or layer rule. - Manually assigning fill rules to nets other than GND. #### What to do: - Open the [Review tab](https://docs.flux.ai/reference/flux-agent) and look for “Multiple fills on a layer” violations. - Determine which net(s) are applying fills on the same layer. - Remove unnecessary fill rules or adjust the stackup if you've imported modules. Only one net should apply fills per layer—typically GND, unless you're working on advanced designs requiring power planes or split fills. ### 3\. Floating Copper **“What is floating copper, and why is it an error?”** [![](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/floating-copper.webp)](#) Floating copper refers to any copper (usually a fill or trace) that is no longer electrically connected to its assigned net. This often happens when components are moved or deleted, leaving behind orphaned copper. #### Steps to fix: - Use the Review tab to locate floating copper DRCs. - Once highlighted, evaluate whether the copper is still needed. - If not, delete it. If it is, reconnect it using a trace or via. - Consider [locking components](https://docs.flux.ai/flux/reference/locking) after placement to prevent accidental shifts. Keeping copper grounded and connected ensures electrical correctness and helps avoid manufacturing issues down the line. ### 4\. Ground Fills Not Appearing **“My board has no visible GND fills—what’s wrong?”** [![](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/no-copper-fills.webp)](#) By default, Flux adds [ground fills](https://docs.flux.ai/reference/reference-ground-fills) to all PCB layers for the GND net. If a fill appears missing, it’s usually a configuration or visibility issue—such as priority, keepouts, or island settings—rather than a bug. #### Troubleshooting tips: - Toggle [layer visibility](https://docs.flux.ai/flux/reference/reference-pcb-editor#show-and-hide-layers) to make sure you’re viewing the correct layer. [![](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/layer-visibility.webp)](#) - Confirm that your net is properly named **GND** and uses the correct symbol. - Open the **Objects** tab in the left panel and check that the GND net has a “Connected Layers” rule with “fills” enabled. - Check your **clearance settings**—if they're too large, fills might not be able to route and appear “missing.” Fills play a crucial role in EMI reduction, return path continuity, and thermal performance, so it's important to verify they're in place. ### 5\. Parts Not Appearing in Your Library **“I created a part, but I can’t find it in my library—where is it?”** When you [create a custom part](https://docs.flux.ai/reference/parts) in Flux, it lives in a private project until you **publish** it. Publishing makes it available in your global or team library. If you change sharing permissions later, you must re-publish the part. #### How to publish: - Open the component’s project. - Click the **Flux Menu** (top left corner). - Select **“Publish to Library…”** - Fill out the publishing details and confirm. > 🔒 By default, newly created parts are private. > If you want others to use it, click **“Share”** and set visibility permissions. Just remember to re-publish after updating [sharing settings](https://docs.flux.ai/flux/reference/reference-sharing-and-permissions). ### 6\. Altium Project Imports Appear Empty **“I imported my Altium file, but nothing shows up.”** This usually comes down to format. Flux only supports **ASCII format** when importing from Altium Designer. If you export in binary format, the import will silently fail or appear blank. #### How to fix: - In Altium, go to **File > Save As…** - Select **ASCII format (.SchDoc)** explicitly - Save, then import the file into Flux > To verify: open the file in a text editor. If it’s human-readable, it’s ASCII. If it’s gibberish, it’s binary. Large schematics? Try breaking them into modules for smoother imports. ### 7\. Auto-Layout Seems Stuck **“Why is Auto-Layout stuck on ‘Optimizing’?”** ![](https://flux.seobdtools.com/p/assets/blogs/top-10-troubleshooting-tips-n-tricks/auto-layou-stuck.webp) Flux’s [Auto-Layout](https://flux.seobdtools.com/p/blog/introducing-ai-auto-layout) feature can take time—especially on complex boards. The “Working” state may appear stuck if design rule checks (DRCs) are unresolved, or if the board has high routing complexity. #### What to check: - Make sure **all DRCs and system errors** are resolved. - Confirm that key nets are still routed (no floating airwires). - Let it run for a bit—large boards can take several hours. If needed, hit **Stop** to investigate and restart. Just be aware that stopping clears progress if changes haven’t been applied. ### 8\. KiCAD Libraries Aren’t Showing Footprints or 3D Models **“I imported a KiCAD part—why is it incomplete?”** Flux supports KiCAD [library imports](https://docs.flux.ai/reference/reference-import-kicad), but some metadata—like footprints or 3D models—need to be linked manually. #### To fix: - Open the part > Inspect tab > Scroll to **Asset Container** - Upload the **.kicad\_mod** footprint file and assign it - For 3D models: - - Upload the model (.step, .wrl, etc.) - Add a **Model Object** to the part and assign the file - Adjust position and orientation if needed Once set, the part will behave like any other in your library. ### 9\. Copilot Isn’t Wiring Components Properly **“Why is Copilot making strange connections?”** Flux Copilot is optimized for specific, context-aware actions. It’s not intended to auto-wire an entire schematic in one go, and complex instructions often reduce its accuracy. #### Best practices: - Ask Copilot to connect **two components at a time** - Use clear terminology (e.g., "Connect ESP32 TX to USB-C RX") - Stick to standard buses like **UART, SPI, I2C, USB** - Review and edit as needed—it’s a teammate, not a replacement With more [focused prompts](https://flux.seobdtools.com/p/blog/top-20-flux-copilot-prompts-refreshed), Copilot becomes a powerful assistant rather than a source of confusion. ### 10\. Finding Help When You’re Blocked **“Where can I go when I need support fast?”** We want you to feel confident using Flux, even when things aren’t going smoothly. Here's how to get help: #### 📚 Resources: - [Flux Documentation](https://docs.flux.ai/) for in-depth guides - [YouTube Tutorials](https://www.youtube.com/@buildwithflux) for visual walkthroughs #### 🗨️ Human Support: - Use the **in-app Support button** to chat with our team - Email help@flux.ai to ask questions #### 🐛 Bug Reports: - Send us a clear description of what went wrong - Include a **screenshot, screen recording**, and/or **project link** - Submit through chat or [feedback.flux.ai](https://feedback.flux.ai/) ### Closing Thoughts Building with Flux means working with one of the most forward-moving platforms in EDA—but we also know that speed comes with bumps along the way. This guide is here to help you smooth them out and keep shipping. Most importantly, **you’re not alone**. Whether it’s a UI quirk, a Copilot misfire, or just needing a second pair of eyes, we’re here to help—through [docs](https://docs.flux.ai/), [videos](https://www.youtube.com/@buildwithflux), or chat. And if something isn’t working the way you expect, let us know. The fastest way we improve Flux is with your feedback. ## About the author [Ryan Fitzgerald](https://flux.seobdtools.com/ryanf) Electronics Engineer at Flux Ryan is an electronics and electrical systems engineer with a focus on bridging the gap between deep learning intelligent algorithms and innovative hardware design. Find him on Flux [@ryanf](https://flux.seobdtools.com/ryanf) 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://flux.seobdtools.com/p/assets/blogs/miscellaneous/sidebar-cta-pcb.webp) [Try it Free](https://flux.seobdtools.com/signup) ## More in AI & Prompt Engineering for Hardware [ ![What Makes a Perfect PCB Design Prompt](https://flux.seobdtools.com/p/assets/blogs/how-to-write-a-perfect-pcb-design-prompt/main.webp) ### What Makes a Perfect PCB Design Prompt 8 Min Read](https://flux.seobdtools.com/p/blog/what-makes-a-perfect-pcb-design-prompt)[ ![Flux, an AI hardware engineer pointing out the dos and don'ts when prompting.](https://flux.seobdtools.com/p/assets/blogs/prompting-guide/main.webp) ### Prompting Guide: Working with Flux from Idea to Schematic 9 Min Read](https://flux.seobdtools.com/p/blog/prompting-guide-working-with-flux-from-idea-to-schematic)[ ![A space-themed image with a central cartoon astronaut helmet against a backdrop of stars and nebulae in shades of purple. 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The review panel highlights capacitor C56 with a red error indicating a voltage rating of 16V, below the required safe margin. A chat response suggests replacement capacitors with part numbers, demonstrating the AI's capability to recommend fixes for flagged issues.](https://flux.seobdtools.com/p/assets/blogs/ai-drc-panel/main.webp) ### Introducing the AI Design Review Tab 4 Min Read](https://flux.seobdtools.com/p/blog/introducing-the-ai-design-review-tab)[ ![Flux Copilot - The First AI Powered Hardware Design Assistant can now route your PCB. Introducing AI Auto-Layout. With just one click, Copilot tackles the repetitive task of routing your board, delivering clean, human-like results that are easy to work with and iterate on.](https://flux.seobdtools.com/p/assets/blogs/ai-auto-layout-v1/main.webp) ### Introducing AI Auto-Layout 4 Min Read](https://flux.seobdtools.com/p/blog/introducing-ai-auto-layout)[ ![Flux Copilot astronaut points at a PCB with the text “Smarter AI Auto‑Layout” overlaid, highlighting the intelligence of Flux’s AI Auto‑Layout feature.](https://flux.seobdtools.com/p/assets/blogs/ai-auto-layout-summer-update/main.webp) ### AI Auto-Layout Just Got Smarter 3 Min Read](https://flux.seobdtools.com/p/blog/ai-auto-layout-just-got-smarter)[ ![An astronaut placing electronics components and tracing complex signals on a complex glowing PCB board.](https://flux.seobdtools.com/p/assets/blogs/ai-auto-layout-v2/main.webp) ### AI Auto-Layout Winter Update 9 Min Read](https://flux.seobdtools.com/p/blog/ai-auto-layout-winter-update)[ ![Flux Copilot suspended in space, intellegently scanning electronic components datasheets](https://flux.seobdtools.com/p/assets/blogs/ditch-datasheets/main.webp) ### Ditch Datasheets with this Flux Copilot Upgrade 2 Min Read](https://flux.seobdtools.com/p/blog/ditch-datasheets-with-this-flux-copilot-upgrade)[ ![Illustration of an astronaut helmet superimposed over a circuit board background, stylized as 'Flux Copilot Vision.' The helmet is detailed with a prominent, reflective visor in shades of purple and white, with a simplified antenna on the side, set against a complex pattern of digital circuits and glowing nodes. This is Copilot Vision, first multi-modal AI for hardware design for electronics and PCB engineers](https://flux.seobdtools.com/p/assets/blogs/copilot_vision/main.webp) ### Flux Copilot Can Now See 3 Min Read](https://flux.seobdtools.com/p/blog/copilot-can-now-see)[ ![Flux copilot writing and optimizing a firmware code of an electronic project](https://flux.seobdtools.com/p/assets/blogs/firmware-productivity-with-ai/main.webp) ### AI for Firmware Development: How to Code Firmware Faster 3 Min Read](https://flux.seobdtools.com/p/blog/code-firmware-faster-with-ai)[ ![Research Components Faster with AI](https://flux.seobdtools.com/p/assets/blogs/ai-component-selection/main.webp) ### Research Components Faster with AI 5 Min Read](https://flux.seobdtools.com/p/blog/research-components-faster-with-ai)[ ![Flux copilot, a hardware design assistant is responding to a user request to provide him drop-in replacement for an electronic component in his project. Behind is a complicated realistic printed circuit board.](https://flux.seobdtools.com/p/assets/blogs/streamline-component-research-with-ai/main.webp) ### Streamline Component Research with AI 2 Min Read](https://flux.seobdtools.com/p/blog/streamline-component-research-with-ai)[ ![Instant Hardware Analysis with AI: Meet Copilot's Code Interpreter](https://flux.seobdtools.com/p/assets/blogs/code-interpreter/main.webp) ### Instant Hardware Analysis with AI: Meet Copilot's Code Interpreter 4 Min Read](https://flux.seobdtools.com/p/blog/instant-hardware-analysis-with-ai-meet-copilots-code-interpreter)[ ![This image displays a sophisticated electronics testing setup. In the foreground, a person's hand holds a probe connected to a circuit board densely populated with various electronic components. The background features an oscilloscope screen showing waveform outputs and a digital meter displaying the number 0.95. A digital overlay on the image presents a test plan for signal integrity checks, listing steps such as confirming a voltage level of 3.3V, checking for a PWM signal at 1 kHz, and ensuring zero voltage (ground). 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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://flux.seobdtools.com/signup) ![Close-up of a Flux-designed printed circuit board](https://flux.seobdtools.com/p/assets/homepage-v2/mission-visual.webp)