1. Shop
  2. Blog
  3. The Complete Genmitsu Laser Guide – Part 2: Software Setup (LightBurn + GRBL)

The Complete Genmitsu Laser Guide – Part 2: Software Setup (LightBurn + GRBL)

Now that your laser is physically installed on your Genmitsu CNC, it’s time to configure the software. In this part of the guide, we’ll walk you through setting up LightBurn to work seamlessly with your GRBL-based Genmitsu machine and laser head — so you can start engraving or cutting with confidence.

🧠 Overview: Why Software Setup Matters

LightBurn gives you full control over laser speed, power, and motion. But without the correct configuration, your laser may not fire properly, could underperform, or even damage materials.

The most important parts to configure are:

  • GRBL firmware settings on the controller

  • LightBurn's power scale ("S-value max")

  • Machine dimensions and safety options

🛠️ Step 1: Connect LightBurn to Your Genmitsu

  1. Launch LightBurn

  2. Go to Devices > Create Manually

  3. Choose GRBL (1.1 or later)

  4. Set the workspace dimensions — for Genmitsu 3018, use:

    • X: 300 mm

    • Y: 180 mm

  5. Name your device (e.g., “Genmitsu Laser”) and finish setup

  6. Connect to your CNC via USB and click "Devices" → "Select"

⚙️ Step 2: Configure GRBL Settings

Open the Console tab in LightBurn and enter:

$30=1000 ; Max spindle speed (PWM max) $31=0 ; Min spindle speed $32=1 ; Enable laser mode

These are essential. $30=1000 means that a PWM value of 1000 equals 100% laser power. $32=1 ensures the controller uses laser-optimized motion paths.

To confirm, enter $$ and look for:

$30=1000 $31=0 $32=1

✅ These must match what you’ll set in LightBurn next.

🖥️ Step 3: LightBurn Settings

Go to Edit > Device Settings and check the following:

  • S-value max → set to 1000 (must match $30)

  • Laser Mode → should be enabled

  • Z-axis control → optional, enable if your laser moves in Z

💡 Tip: Enable "G-code Clipping Prevention" to avoid edge-positioning issues.

🔬 Step 4: Test Your Setup

  1. Create a small shape (like a square or nameplate)

  2. Use Line Mode for basic engraving

  3. Set speed to 2000 mm/min, power to 10%

  4. Click "Frame" to check placement

  5. Click Start to run the job

If the laser doesn't fire:

  • Double-check wiring

  • Confirm PWM signal is active on your spindle pin

  • Recheck $30, $31, $32 and S-value

✅ Optional: Save Your GRBL Settings

Once everything is working, go to Console > Save Config to export your GRBL settings for future use or backup.

🎯 What’s Next?

With LightBurn fully configured and your Genmitsu laser responding correctly, you're ready to dive into material testing and project work. But first — it’s important to know which machines and firmware versions are best suited for upgrades like this.

📎 Part 3: Compatibility and Control →
(We’ll explore which Genmitsu models work best, what firmware features to look for, and how to ensure safe PWM control.)

🔗 Additional Resources

👉 Visit the Genmitsu 3018 CNC Machine page
👉 View Laser Kits for Genmitsu CNC

  Posted by Opt Lasers     Genmitsu views (2209)