This video introduces "VIA Grid," a novel method for ultra-rapid in-house PCB prototyping that addresses the long-standing difficulty of creating vias. The core concept involves using standardized, pre-fabricated FR4 PCB blanks that feature a grid of factory-made, plated-through vias. The prototyping workflow shifts from creating vias to simply defining traces around them. This is achieved using a UV Diode-Pumped Solid-State (DPSS) laser, which can ablate the copper layer of standard FR4 boards without making the substrate conductive—a critical advantage over other laser types. The process includes a custom physical alignment jig with a two-plate system and unique "Pac-Man" fiducials on the board for precise, software-independent registration. The video demonstrates that this technique, combined with a pick-and-place machine and reflow oven, can reduce the entire prototyping cycle, from digital design to a fully functional, double-sided SMT board, to under 90 minutes. The project is open-sourced on GitHub to encourage community collaboration and refinement of the standard.
VIA Grid: From PCB Design to Finished Board in 90 Minutes
0:00 The VIA Prototyping Problem: The video identifies the primary bottleneck in rapid PCB prototyping: creating reliable vias (connections between layers) is complex, time-consuming, and requires specialized chemicals or clumsy hardware rivets.
0:21 The VIA Grid Solution: The proposed solution is to use a standardized PCB blank that comes with a pre-fabricated array of high-quality, factory-made vias. Prototyping then becomes a process of etching away copper to define traces that connect to these existing vias.
0:45 The 90-Minute Workflow: The complete process is outlined: design a schematic using a VIA Grid template in KiCad, export the layout, align the board in the laser, etch both sides, populate with a pick-and-place machine, and reflow. The entire cycle can be completed in under 90 minutes.
1:37 The Enabling Technology (UV Laser): The process relies on a UV DPSS (Diode-Pumped Solid-State) laser. Unlike fiber lasers that can make FR4 conductive, the UV laser cleanly ablates the copper without damaging the substrate, making it ideal for this application.
3:01 A Clever Alignment System: A major challenge, aligning the PCB to the pre-existing vias, is solved with a physical two-plate jig. The user visually aligns the laser's low-power frame with "Pac-Man" shaped fiducials on the PCB corners, allowing for fast and precise physical adjustment without complex software calibration.
4:27 Evolving the VIA Layout: The design of the via grid itself was iterated upon. An initial dense layout was found to be difficult to align, so the final design uses a more spaced-out, forgiving pattern that doesn't compromise routing ability.
5:30 Real-World Success Story: The creator demonstrates the system's power by quickly recreating a complex programming jig for their Lumen P&P machine. The design and layout took only 20 minutes, resulting in a finished, functional PCB a couple of hours later.
6:22 A New Prototyping Paradigm: The video posits that this method could be for hardware engineering what 3D printing was for mechanical engineering, creating a new standard for in-house, rapid iteration of high-quality, two-layer PCBs without janky jumper wires.
7:14 Open Source & Call for Collaboration: All project files, including KiCad templates, LightBurn settings, and the alignment jig design, are available on GitHub. The creator is actively seeking feedback and collaborators to refine the standard and is even offering to send free VIA Grid boards to those interested in helping.