Knowledge
Practical LightBurn guides, settings, testing workflows and troubleshooting — written for real workshop use.
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170 articles
Cutting Preflight: Focus, Air, Frame, Preview and Test
Reliable cutting comes from a repeatable preflight: material identification, focus, air assist, clean optics, correct layer settings, Preview and Framing.
Output, Show and Hidden Layer Surprises
A visible object does not automatically mean it will be sent to the laser, and an output-enabled layer can contain geometry you forgot about.
Minimum Power, Slowdowns and Corner Behavior
Some controllers expose minimum/maximum power behavior that changes output as speed varies; do not assume all GCode, DSP and Galvo devices interpret minimum power the same way.
Perforation Mode: Dash and Gap Without Manual Segments
Perforation Mode turns continuous vector paths into alternating cut and gap segments, useful for tear lines, fold guides and decorative dashed cuts.
M3 vs M4: Constant and Dynamic Laser Power
On GRBL laser-mode workflows, M4 dynamically reduces power as motion slows, while M3 is constant-power behavior; device type and $32 determine whether M4 is valid.
Air Assist in Layer Settings and Real-World Cutting
Air assist can improve cutting and reduce flame/soot, but software control only works when the machine hardware/controller supports it.
Framing Modes: Bounding Box vs Shape Outline
Framing is a physical placement check; different frame modes trace different boundaries and can reveal different placement problems.
G54–G59 and G92: Work Coordinate Offsets
Work coordinate systems and G92 can shift commanded coordinates without changing physical machine zero; this matters when reading Console output or custom G-code.
The 9-Dot Job Origin Control
In Current Position and User Origin workflows, the 9-dot control tells LightBurn which point of the job is tied to the current/user reference position.
GRBL Homing Cycle: $22–$27 in Context
Homing is a sequence, not a single switch: enable state, direction mask, seek speed, locate speed, debounce and pull-off must work together.
GRBL Hard Limits: $21, Switches and False Triggers
$21 makes physical limit inputs an emergency stop source; a trigger can be a real collision risk or electrical noise, so ALARM:1 needs evidence.
GRBL Soft Limits: What $20 Actually Protects
$20 soft limits prevent commanded motion beyond the configured machine travel, but only when the controller has a trustworthy position reference.
GRBL Negative Workspace and Workspace Offsets
Some GRBL machines home at max travel and use negative machine coordinates across the bed; LightBurn must be configured consistently with that machine coordinate model.
Machine Origin vs Home Position
Machine origin is the controller coordinate reference; the physical homing location may be a corner that establishes that reference but is not necessarily the same concept.
Camera Calibration, Alignment and Overlay in LightBurn 2.1
Separate lens calibration from workspace alignment and know what must be repeated when a camera is moved.
Rotary Mode: Set Up Cylindrical Engraving Without Losing Your Flat-Bed Workflow
Understand the parameters that map linear design motion to rotary movement and create a safe checklist for enabling and disabling Rotary Mode.
GRBL Errors and Alarms: Read the Console Before You Unlock Anything
Treat GRBL alarm/error numbers as diagnostic messages and fix the cause instead of reflexively clearing the controller state.
Connection Troubleshooting: USB, Port, Power and 'Connected but Not Responding'
Diagnose connection failures in a safe order before changing firmware or random controller settings.
Homing, Machine Origin, Workspace and Soft Limits
Understand the coordinate chain that lets a GRBL-style machine know where it is and prevents jobs from being planned outside known travel.
Device Settings: Build a Safe Machine Baseline
Understand which LightBurn settings describe the machine rather than a single project and why controller-specific options must match hardware capability.
Variable Text: CSV Merges, Serial Numbers, Dates and Offsets
Automate personalized or numbered batches while controlling current values, offsets and preview verification.
Text, Fonts and Convert to Path
Create editable text safely, understand font dependency, and know when converting to paths is necessary for geometry editing or portability.
Grid and Circular Arrays for Batch Production
Duplicate designs with controlled spacing, use virtual arrays where appropriate, and combine arrays with Variable Text for production batches.
Delete Duplicates: Fix Hidden Double Cuts and Broken Fills
Find identical overlapping objects that can cause extra Line passes, strange Fill behavior or confusing Preview output.