Unlocking Precision: Optimizing Creality Falcon 2 with LightBurn Settings

First, a framing fix, because the older version of this page got it wrong: the Creality Falcon2 is not a 3D printer. Nothing on it melts filament or builds “prints” layer by layer. It is a diode laser engraver and cutter — a 455 nm blue diode module on a gantry that burns, marks and cuts sheet material. It was sold with laser modules in roughly the 12W, 22W and 40W classes (plus later enclosed Falcon2 Pro models), and the settings question is the same for all of them: how do you set speed and power in LightBurn, the software most owners run it with? This guide covers connecting the Falcon2 to LightBurn properly, then the honest way to find settings — testing, not copying numbers off the internet.

Connecting the Falcon2 to LightBurn

The Falcon2 runs GRBL-based firmware, and LightBurn talks to it like any GRBL machine:

1. Create the device in LightBurn (Devices → Create Manually) and choose GRBL as the device type. Name it after your model — “Falcon2 22W”, for example — since settings differ sharply between 12W and 40W modules.
2. Connect over USB. The Falcon2 links to the computer by USB cable (offline TF-card running exists, but setup and live control are over USB). Pick the matching COM/serial port in LightBurn; the default baud rate for GRBL devices is normally 115,200.
3. Enter the work area. For the standard Falcon2 frame this is approximately 400 × 415 mm; enter your model’s actual engraving area from its manual and keep designs inside it.
4. Check the S-value max. In LightBurn’s device settings, the “S-value max” should match the machine’s $30 GRBL setting — 1,000 is the usual figure on these controllers. If the two disagree, LightBurn’s 100% will not mean the machine’s 100%, and every tested setting will be quietly wrong.
5. Set focus before anything else. LightBurn cannot focus the laser for you. The Falcon2 module focuses manually — use the focus block/gauge supplied with the machine, or set the module height per the manual. Every test below assumes focus is set; an out-of-focus diode wastes power no setting can recover.

Origin, homing and “Start From”

The Falcon2 homes toward its limit switches when homing is enabled, which gives LightBurn a repeatable machine origin. Two habits prevent most beginner disasters:

• Use “Absolute Coords” while learning. What you see on the LightBurn canvas is where the job lands on the bed. Once you understand the machine, “Current Position” with the Frame button (which traces the job outline before cutting) is the faster workflow for one-off pieces.
• Frame every job. Ten seconds that catch mirrored designs, wrong origins and material outside the work area before anything burns.

Air assist and camera — the workflow features that matter

• Air assist: the Falcon2 has integrated air assist with a manual adjustment knob, and on supported setups LightBurn can switch airflow with the job. For cutting, air on is the default: it clears smoke and flame from the lens, deepens cuts and reduces charring. Turn it down or off for light surface engraving on paper or leather, where a full blast can shift the workpiece and worsen smoke staining.
• Camera: the open-frame Falcon2 does not include a built-in camera; a camera is fitted to the enclosed Falcon2 Pro models. If your machine has one (or you mount a LightBurn camera on the frame), calibrate it and it becomes a placement tool — overlay designs on a live view of the material, nest parts into offcuts, align engravings on irregular blanks. It changes positioning workflow, not laser settings.

The honest way to find settings: the material test grid

There is no universal table of Falcon2 settings: output depends on your module’s wattage, the exact material batch, its thickness, even its moisture. What experienced owners do instead — and what LightBurn makes easy — is run a material test grid on scrap of the actual material:

1. In LightBurn, open Laser Tools → Material Test. It generates a grid of small squares: speed varies along one axis, power along the other, each cell labelled.
2. Set ranges that bracket the sensible zone for your wattage class (use the starting ranges below as the centre, not the edges), and run it on scrap of the same material and thickness — ideally an offcut of the job sheet itself.
3. Read the grid like a map. For engraving, pick the cell with the darkness and detail you want at the highest speed — that is your efficient setting. For cutting, find the cells that cut fully through (pieces drop or push out cleanly), then back off to the slowest-speed/lowest-power pairing that still cuts reliably: it is kindest to the lens and leaves the cleanest edge.
4. Save the winner in LightBurn’s material library under the material and thickness. A library built from your own tests beats any settings chart — it describes your machine and your materials.

Starting ranges — test points, not promises

The figures below are conservative starting ranges for a first test grid, not finished settings. Power is LightBurn percentage; speed is mm/min. Halve your expectations for a 12W module (mainly an engraving and thin-material machine). Always confirm on scrap.

Material (typical thickness)	Job	Speed (mm/min)	Power	Passes	Notes
Basswood plywood (3 mm)	Engrave	3,000–6,000	40–70%	1	Air assist low; watch for smoke staining
Basswood plywood (3 mm)	Cut	300–600 (22W) / 600–1,000 (40W)	85–100%	1	Air assist on; 12W will likely need 2–3 slower passes
MDF (3 mm)	Engrave	2,500–5,000	40–65%	1	Glue makes MDF mark darker and dirtier than ply
MDF (3 mm)	Cut	250–500 (22W) / 500–900 (40W)	85–100%	1–2	Ventilation matters — MDF fumes are unpleasant
Acrylic (3 mm, cast)	Engrave	2,000–4,000	30–55%	1	Cast engraves frosty white; extruded tends to melt and engrave clear/gummy
Acrylic (3 mm, cast)	Cut	200–450 (22W)	85–100%	1–2	Cast cuts cleaner than extruded; blue diodes cannot cut clear acrylic — it passes the wavelength through
Leather (genuine, 1.5–2.5 mm)	Engrave	3,000–6,000	25–45%	1	Low power, air off/down; test — leather marks fast and stinks
Anodised aluminium	Engrave/mark	2,500–5,000	50–85%	1	The diode marks the anodised layer, not bare metal; bare aluminium is essentially out of reach for a blue diode

Two rules hide inside that table. Engraving wants speed and restraint — excess power at low speed digs a charred trench. Cutting wants commitment — near-full power and a speed slow enough to sever the fibres. And interval (line spacing) matters for photo engraving: 0.08–0.12 mm is a sane test zone; finer mostly adds time and heat.

Safety: the non-negotiable section

A diode laser in this class can blind and can set your workshop on fire. These are not disclaimers; they are operating rules.

• Never leave the machine running unattended. Most laser fires start as a small flame on a cut that stalled. Stay in the room, every job, and keep a suitable extinguisher within reach.
• Protect your eyes. Wear wavelength-rated safety glasses for a 455 nm diode whenever the laser fires outside an enclosure, and never look at the beam or its reflections. Enclosed Falcon2 Pro models carry Class 1 ratings and lid interlocks; the open-frame Falcon2 relies on you.
• Ventilate. Cutting wood, MDF and acrylic produces smoke and fumes you should not breathe. Exhaust them outside or through proper filtration; treat the machine’s airflow/flame monitoring as a backup, never the plan.
• Know your material, or do not cut it. Never laser PVC or vinyl — they release chlorine gas, which is toxic and corrodes the machine. Treat unknown plastics, possibly synthetic “leather” and mystery composites the same way: unidentified means no. Acrylic is chemically laser-safe but flammable — the material most often involved in laser fires — so it gets your closest attention while cutting.
• Supervise the crash cases. If the gantry stalls, material shifts, or a cut piece tips into the beam path, stop the job — the Falcon2’s tilt/limit protections and emergency stop exist for exactly this. A stationary focused beam starts fires in seconds.

Frequently asked questions

Does the Falcon2 need LightBurn, or can I use free software?

It also runs with LaserGRBL, which is free and enough for simple work. LightBurn is the usual upgrade for its material test generator, material library, camera support and better design tools — but the settings logic (speed, power, passes) is identical in both.

Why won’t my Falcon2 cut clear acrylic?

Because a 455 nm blue diode’s light passes through transparent material instead of being absorbed. Dark, opaque acrylics absorb it and cut; clear acrylic essentially ignores the beam. This is a physics limit of diode lasers, not a settings problem — no power or pass count fixes it.

Why do settings from a video or forum not work on my machine?

Usually one of four reasons: a different wattage module (12W settings do not transfer to a 40W), a different material batch or thickness, focus slightly off, or an S-value mismatch between LightBurn and the machine. Run the material test grid on your own scrap — it removes all four variables at once.

Can the Falcon2 engrave metal?

It can mark coated and anodised metals (the beam removes or darkens the coating) and darken stainless steel at high power and low speed — the basis of the colour-marking effects on steel. It does not truly engrave into bare metal the way a fibre laser does: expect surface marking, not depth.