K40 Whisperer 0.68

Overview

K40 Whisperer is a free, open-source Windows/Mac/Linux application from Scorch Works that replaces the stock LaserDRW software for inexpensive K40-style CO2 laser cutters. Focused on reliability and practical workflow rather than flashy features, K40 Whisperer interprets SVG and DXF artwork, splits vector and raster content, and sends motion and firing commands directly to compatible Lihuiyu controller boards.

Key features

• Reads SVG and DXF input and separates content by color: red for cuts, blue for vector engraving, and other colors for raster engraving.
• Raster processing with optional halftone (dither) mode to simulate grayscale engraving on stock K40 controllers that lack true power modulation.
• Cut-order logic that cuts internal features before outer profiles to prevent parts from falling out mid-job.
• Real-time visual preview of toolpaths and job progress so you can verify artwork and positioning before and during runs.
• Support for multiple Lihuiyu-based controller boards (including M2/M3 Nano variants) and extended features when paired with boards capable of laser power control and Z-axis or test pulse functionality.
• Lightweight, actively maintained codebase distributed under the GNU GPL with downloadable installers and source archives.

Compatibility and supported hardware

K40 Whisperer works with controllers compatible with LaserDRW (Lihuiyu boards). Known-working boards include many LASER-M2/M3 and related 6C6879 variants as well as several HT-series boards when set to the correct profile. Moshi-based controllers are not supported. The easiest way to confirm compatibility is to check whether a laser comes bundled with LaserDRW.

File preparation and workflow

1. Create designs in Inkscape or another vector editor and export as SVG (recommended) or DXF.
2. Use color conventions: red for cuts, blue for vector engrave, black/other colors for raster engraving. DXF handling uses color and layer name rules (layers with "engrave" trigger vector engraving).
3. Open the SVG/DXF in K40 Whisperer, preview the toolpaths, adjust scale or position, and choose raster settings (including halftone) as needed.
4. Send the job to the cutter and monitor the on-screen progress and pause/resume controls during the run.

Installation and documentation

• Downloadable installers and source packages are provided for Windows (32/64-bit) and source archives for Mac and Linux.
• Setup instructions and platform-specific README files are included; community guides and third-party Mac tutorials help where official Mac support is limited.
• Comprehensive reference manual, change log, and how-to videos explain halftone engraving, advanced settings, alignment tools, and using G-code workarounds.

Limitations and considerations

• Grayscale engraving on stock K40 controllers is simulated via halftoning because many stock boards cannot modulate laser power continuously.
• Only controllers compatible with LaserDRW/Lihuiyu boards are supported; some popular controller families are incompatible.
• Mac installation may require additional community-sourced instructions; developer support for Mac-specific issues is limited.

Why K40 Whisperer is worth trying

For hobbyists and small workshops using K40-style CO2 lasers, K40 Whisperer delivers a focused, stable replacement for the bundled software with strong SVG/DXF handling, sensible workflow rules, and preview-based job validation. Its open-source nature, active changelog, and support for enhanced controller boards (M2/M3 Nano) make it a practical choice for users who want predictable cutting and engraving results without paying for commercial laser software.