# @stem_antics on Instagram

- **Type:** Video
- **Original URL:** https://www.instagram.com/p/DXniVxJgBuY
- **Gondola URL:** https://gondola.cc/posts/64883918-stem-antics-instagram
- **Thumbnail:** https://img.gondola.cc/tr:w-,h-,fo-auto/postThumbnails/52e9058897.jpg
- **Posted:** 2026-04-27T02:07:43.000+00:00
- **Account Owner:** Stem Antics (@stem_antics) — https://gondola.cc/stem_antics

## Caption

Turning a copper-clad board into a functional PCB using a laser is essentially a subtractive manufacturing process driven by precise energy deposition. A focused laser beam locally ablates the copper layer, removing conductive material where isolation is required and leaving behind the intended traces.

The workflow starts with a PCB layout exported as vector paths (typically from KiCad or Eagle). These paths are converted into toolpaths that control laser motion and power. Key parameters include wavelength, pulse duration, spot size, and power density—each influencing how efficiently copper is removed without damaging the substrate (usually FR-4). Because copper has high reflectivity in the visible range, shorter wavelengths (e.g., UV) or higher energy densities improve absorption and ablation efficiency.

Thermal management is critical. Excess energy can delaminate the substrate or char the epoxy resin beneath the copper. To mitigate this, passes are often done in multiple low-power iterations rather than a single high-power sweep. Assist gases (like air) can help clear debris and improve edge quality.

Compared to chemical etching, laser ablation eliminates wet chemistry and enables rapid iteration, but it requires careful calibration to achieve consistent trace widths and avoid micro-bridging. Resolution is limited by beam diameter and material interaction, so fine-pitch designs still demand optimization.

This method is increasingly viable for prototyping and small-batch fabrication, especially when integrated into a digital workflow where design changes can be executed and tested within minutes.

Comment how you would optimize this process, remix with your own setup, and share with someone building their first PCB.

#STEMeducation #PCBdesign #LaserProcessing #ElectronicsEngineering #DigitalFabrication

## Stats

- **Views:** 15,123
- **Likes:** 159
- **Shares:** 0
- **Comments:** 1

## Tags

digitalfabrication, electronicsengineering, stemeducation, laserprocessing, pcbdesign

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