Custom Hardware Enclosures by Flux: From PCB to Product in Hand

Hardware doesn’t end with a circuit board. It takes so much more to bring your ideas to life. At Flux, we’re building the AI hardware engineer that takes you from idea to complete working product in hand.

Today, we’re thrilled to announce our first giant leap beyond printed circuit boards: custom enclosures. Flux will now develop design concepts, iterate with you, and create complete, manufacturable enclosures tailored to your project requirements.

Streamlining the Prototyping Process

It generally takes weeks or months to get a viable device across the finish line. A big part of this friction is the sheer amount of specialized expertise involved from firmware development and electrical engineering, to mechanical engineering and industrial design. Many hardware founders discover the lines between disciplines – and the need for yet another specialist to bring their project closer to the finish line – the hard way.

Translating what you do in CAD into a physical object has remained virtually as difficult as it was in the 1990s and the tools themselves remain accessible to only a small group of specialists. Getting to a manufactured prototype takes a long, long time, and every iterative cycle tests your patience and your budget.

Seamless PCB and Enclosure Coordination

Traditionally, mechanical engineers and electronics designers work in isolated silos, leading to a massive coordination problem. Picture a mechanical engineer waiting to receive a static STL file of the PCB from the electrical team.

If you change components on the PCB, you suddenly need different standoff distances. If you move a connector that acts as a plug, you also have to manually shift the case cutouts so everything still fits. Because version controlling between these two domains is difficult, the industry relies on a rigid waterfall process: write requirements, design the PCB, design the PCB enclosure, and finally manufacture. Using brittle STEP (a standard 3D CAD format) and STL handoffs makes iterating incredibly painful, and a single misaligned mounting hole means a 2-hour 3D print goes straight into the bin.

Unlocking Faster Time-to-Market

Every delay in the design phase postpones the vital insights needed from testing with real customers. Unlike software, you can't just code a hardware prototype over a weekend. Traditionally, teams are trapped in a rigid waterfall process where shifting a single USB-C plug forces a complete enclosure redesign.

For hardware entrepreneurs, the goal is building a physical prototype to pitch to investors and users. A bare board isn't enough; they need a functional, testable object they can hold in their hands, whether it’s a consumer device or an industrial water monitor.

By integrating PCB metadata directly into enclosure generation, Flux allows you to design the board and body in tandem. This eliminates manual CAD bottlenecks, automatically syncs cutouts and mounting holes when components move, and shrinks the timeline to get a 3D-printed prototype from months down to mere days.

Accelerating Design with Native PCB Context

Because your PCB design already happens in Flux, the platform inherently understands your board. Component metadata, standoff distances, plug shapes, and data sheets are already captured natively.

When you ask for an enclosure, Flux shapes the case alongside your board so all the components fit flawlessly. Because your PCB and its 3D space are designed together, changes instantly reflect across both. Alter the enclosure's shape or shift a USB-C port, and the updates automatically cascade to the other. There is nothing to model, measure, or reconcile by hand. Flux reads the true board dimensions and thermal data to place vents exactly where the heat is, without a single manual dimension.

This capability goes far beyond standard boxes. Whether you need a test stand for an early prototype or a complete, durable enclosure for field testing, Flux has you covered. You can generate precise hole cutouts, snap fits, and secure lids that are explicitly optimized for 3D printing. Flux generates all the mechanical assets necessary to make your entire process faster.

What People Are Prototyping?

Every one of these boards needs a case, a bracket, or a test fixture, and the PCB context in Flux is already there to design it:

• The High Fidelity Class-D Audio Amplifier is a 50-W stereo amp that turns any line-level audio source into speaker output, perfect for a DIY bookshelf or powered-speaker build. For a product like this, the audio jacks, power input, and heat dissipation all depend on the board's position; Enclosure makes it simple to arrange them so connectors sit flush and the amp stays cool.

• The Modern Distortion Effect Pedal v1 is a guitar distortion pedal currently sent for manufacturing, built for players who want a stomp-and-go tone with relay true-bypass so the signal stays clean when the effect is off. A pedal lives or dies by its mechanical fit, meaning the footswitch, knobs, and jacks must all pass through the case.

• The ESP32 Dual Ultrasonic Water Level Monitor is a manufactured ESP32-based monitor for water tanks and reservoirs that measures levels with two ultrasonic sensors and switches pumps or valves through relay outputs, so a tank never runs dry or overflows unattended. As a field device with external sensors and relay wiring, the sensor and cable openings must match the board.

• The GPS Antenna is a small GPS receiver board with an SMA antenna jack, the kind of module that gives a tracker, drone, or clock its position fix. Because the antenna connector must sit flush at the board edge, its placement has to match the case opening exactly. Enclosure helped make sure it lands where it should.