Laser 3018 Pro: 7 Essential Tips to Master Your First Engraving Project

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  Key takeaways
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  Pick Material That the laser 3018 pro Can Actually Cut
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  Dial In Power and Speed With a Test Grid
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  Focus, Alignment, and Clean Vector Files
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  Hold the Part Down and Control the Air
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  Post-Process the Part and Know When to Move to CNC
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  First-Job Sequence From Unboxing to Finished Part
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  Laser Engraving vs CNC Machining: Which Process Fits the Feature

The laser 3018 pro is a 5 W class diode machine with a fixed wavelength around 445 nm. It absorbs well into organics and dark pigments, and poorly into bare metal. That single fact decides what you can put on the bed. Basswood, plywood, MDF, black and colored acrylic, leather, cardboard, and anodized aluminum are all workable. Bare brass, copper, and raw steel are not, unless you coat the surface with a marking compound first.

Surface condition drives the result more than most beginners expect. Sand wood to 220 grit, then wipe with a tack cloth. Skip the wipe and the laser burns dust instead of fiber, which leaves a smeared dark blotch. Acrylic should be masked with transfer tape so the beam does not deposit vaporized plastic back on the surface. Leather needs low-tack tape for the same reason.

Test on a scrap piece of the exact same stock. A 100 × 100 mm offcut costs nothing and tells you more than any settings chart, because wood density and acrylic formulation vary between batches. If you cannot get a matching offcut, cut a small square from a hidden edge of the final part.

A word on thickness. A 5 W diode will engrave and score, but deep cutting is slow and often uneven. Keep engraving stock under 5 mm. Anything thicker is better handled as a marking pass or moved to another process.

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  Good first materialsBasswood, birch plywood, MDF, cast acrylic, veg-tan leather, anodized aluminum.
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  Avoid on a bare diodeRaw copper, brass, stainless, clear glass, white or transparent acrylic.
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  AlwaysTest on the same batch of stock with the same surface prep.

Power and speed do not act independently. Doubling power at the same feed gives a darker, wider mark; doubling feed at the same power gives a lighter, finer one. Change them one at a time and record what you see. A notebook or a spreadsheet beats memory after the third job.

The fastest way to find a working pair is a test grid. In LightBurn, draw a 5×5 matrix of 10 mm filled squares. Set speed from 300 to 1,500 mm/min across columns and power from 20% to 100% across rows. Run it on scrap, then look at the result under a loupe. You want the cell with a clean edge, even density, and no burn-through. Anything that looks scorched is too hot.

For a 5 W diode on 3 mm basswood, a workable starting point is 600 mm/min at 60% power for a filled engraving, and 1,200 mm/min at 40% for line work. On black cast acrylic, drop to 800 mm/min at 45%. These are starting points, not settings. Your machine, lens, and material batch will move them.

Passes matter too. Two light passes at 40% usually beat one pass at 80%, because the second pass cleans up the first without charring the edges. If you see a brown halo around the mark, reduce power and add a pass rather than slowing the feed further.

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  Change one variablePower or speed, never both in the same test.
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  Grid size5 × 5 cells, 10 mm squares, run on scrap.
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  Charring signalBrown halo or raised edge means too much power or too slow a feed.

Focus sets the spot size, and spot size sets the line width. The stock laser 3018 pro has no autofocus, so you set the gap by hand. Lower the head until the lens-to-surface distance matches the focal length of your lens, usually around 20 mm to 40 mm depending on the module. Use the supplied focus spacer or a slip gauge, not your eye. A blurry line means the beam is out of focus, not that the power is too low.

Check alignment across the whole bed, not just at the origin. Jog the head to all four corners and measure the gap at each one. If the numbers drift by more than 0.5 mm, the bed is not parallel to the gantry. Shim the bed or level the frame before you engrave a large part. On a 300 × 180 mm bed, a 1 mm tilt is enough to blur one side of the job.

Vector files deserve the same attention. Export SVG or DXF with the drawing at 1:1 scale in millimeters. Do not scale in the laser software; scale in CAD and re-export. Set line width to a hairline and use a closed path where you want a fill. A stray open path in a filled layer produces thin streaks across the mark.

For raster images, 254 DPI is a sensible default. Going to 600 DPI on a 5 W diode does not add visible detail; it just doubles the runtime and the heat load. If the source image is low resolution, upscaling will not create information, so redraw the logo as vector instead.

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  Focus methodSlip gauge or spacer at the lens-to-surface gap. Verify at four corners.
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  Alignment toleranceKeep corner-to-corner gap variation under 0.5 mm.
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  File format1:1 SVG or DXF in millimeters, hairline strokes, closed fill paths.
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  Raster default254 DPI for photos, vector for logos and text.

Part shift is the most common cause of a ruined first job. A 1 mm slide between passes produces a double line that cannot be fixed. Tape works for flat stock: blue painter tape on the underside, or transfer tape on top if the surface is delicate. For small parts, use double-sided tape or a low-profile clamp. Avoid metal clamps near the beam path; they reflect and can damage the lens.

Ventilation is not optional. Diode lasers on wood, leather, and acrylic produce fine particulate and volatile organic compounds. Run an exhaust fan to the outside, or use an enclosed unit with a carbon filter. Place the machine where you can see the cut for the full duration. Never leave a running job unattended, even for a minute.

Keep a fire blanket and a small CO₂ extinguisher within arm's reach. A water spray bottle works for small flare-ups on wood, but only if the machine is powered down. Clean the bed and the lens after every job. A dirty lens absorbs energy, heats up, and degrades the spot. Wipe with a lint-free swab and lens cleaner only.

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  Hold-downTape, vacuum, or low-profile clamps. No reflective metal in the beam path.
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  VentilationExhaust to outside or carbon-filtered enclosure.
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  Never unattendedStay in the room for the full cut cycle.

After the laser stops, the work is not finished. Wood engravings collect soot in the recess. Blow it out with compressed air, then wipe with a soft brush. Acrylic edges can be flame-polished with a quick pass of a heat gun, held 100 mm away and kept moving. Leather benefits from a light coat of wax or finish to seal the burned edge. Anodized aluminum needs only a wipe with isopropyl alcohol.

This is also the point where you decide whether the part is done. Laser engraving marks a surface. It does not hold a dimensional tolerance, it does not create a thread, and it will not produce a mating face. If your drawing has a Ø tolerance, a flatness callout, or a bore that must fit a bearing, the laser is the wrong tool.

For those parts, the transition is to CNC. At GreatLight we run 127 high-precision machines, including 16 simultaneous 5-axis machining centers, with tolerances held to ±0.005 mm and surface finishes from Ra 0.8–1.6 μm. A laser-marked logo on the face of a machined aluminum housing is a normal combination: machine the geometry, then mark the identifier.

If you are at that stage, send the model. We return a quotation and a free DFM analysis within 12 hours, and production can start within 24 hours. No minimum order quantity applies, so a single prototype and a 10,000-part run go through the same quoting path.

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  Clean the markCompressed air, soft brush, isopropyl alcohol for metal.
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  Seal the surfaceWax on leather, flame polish on acrylic, clear coat on bare wood.
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  Move to CNC whenThe drawing carries a tolerance, a thread, or a mating fit.