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The Complete Genmitsu Laser Guide – Part 3: Compatibility and Control

After installing the laser and configuring LightBurn, it’s time to ensure that your Genmitsu CNC machine is fully compatible — both electrically and mechanically — with your laser system. In this part of the guide, we'll explain:

  • Which Genmitsu models are laser-ready

  • What firmware features are required

  • How PWM control works with Genmitsu boards

  • What to avoid for long-term stability and safety

🧩 Is My Genmitsu Compatible with a Laser?

The good news: Most Genmitsu machines are laser-upgradable.

✅ Confirmed Compatible Models:

  • Genmitsu 3018-PRO

  • Genmitsu 3018-PROVer

  • Genmitsu 3018-PROVer Mach3

  • Genmitsu 4030-PRO (with PWM pin access)

These models all run on GRBL-based controllers, which support PWM output and are widely compatible with diode lasers.

⚡ Does My Controller Support PWM?

PWM (Pulse Width Modulation) is essential for controlling laser power through software. You’ll usually find it on:

  • The spindle control header (3-pin or 4-pin)

  • Labeled as “S”, “PWM”, or “Spindle”

You’re ready if your board has:

  • PWM output (S or spindle pin)

  • Shared GND

  • External power input (12V or 24V for laser module)

✅ These signals are what our laser kits are built to connect with directly — no hacking required.

❗ What to Avoid

  • Don’t power the laser directly from Genmitsu’s stock 12V/2A adapter — it's not powerful or stable enough.

  • Avoid using old GRBL firmware (< 1.1f) — laser mode won’t work reliably.

  • Don’t exceed your controller’s current limits — always use a dedicated power supply for the laser.

For more on safe power, check out our article:
“Is Genmitsu’s power supply enough for a 6W laser?”

🧠 Understanding PWM Signal Scaling

GRBL uses a numerical value (0 to $30) to scale laser power:

  • $30=1000 means max PWM = 1000

  • In LightBurn, the “S-value max” must match this number

This ensures 100% in LightBurn equals full power on your laser.

🧪 Fine-Tuning Control

If you're seeing weak engraving or inconsistent cuts:

  • Check your $32=1 → laser mode ON

  • Ensure $30 = LightBurn S-value

  • Use Line Mode for engraving speed tests

  • Use air assist for clean plywood cuts

If your controller isn’t responding to PWM correctly, contact our support team — we can help you verify the signal with a multimeter or oscilloscope.

📎 Coming Up: Plug&Play Kits for Genmitsu

Now that your machine and firmware are laser-ready, the final step is choosing a laser kit that fits your workflow, materials, and power needs.

📎 Part 4: Plug&Play Kits for Genmitsu →

🔗 Additional Resources

👉 Visit the Genmitsu CNC Machine page
👉 See All Compatible Laser Kits for Genmitsu

Want help confirming compatibility or choosing the right laser? Reach out to our team — we’ll guide you step-by-step.

  Posted by Opt Lasers     Genmitsu views (1423)