Find duplicate lines before laser cutting
Duplicate lines make the laser cut the same path twice, leaving scorched edges and wasting time. Find them in SVG or DXF files and remove exact copies.
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Where duplicates come from
- Pasting a shape twice in the same place.
- Nesting parts so they share an edge: both parts still have their own copy of that edge.
- Tracing a bitmap, which can create stacked outlines.
- Exporting both a shape and its outline, or a group and its contents.
- CAD drawings where blocks overlap other geometry.
Shared edges in nested parts
When two parts touch, the shared edge is often a partial overlap rather than an exact duplicate: one long line lying along part of another. The check reports these overlaps so you can decide what to do, but only removes exact duplicates automatically. In LightBurn, Edit → Delete Duplicates also handles many overlap cases; in AutoCAD, OVERKILL does.
Questions
What counts as a duplicate?
Two shapes with the same geometry within 0.001 mm, including a line drawn in the opposite direction or a closed shape starting at a different point. Shapes that only partly overlap are reported separately, not removed.
Is removing duplicates safe?
Removing exact duplicates doesn't change what gets cut, except that each line is cut once. The download keeps the first copy of each shape and leaves everything else in the file untouched.
Why would I want a line cut twice?
Sometimes for thick material, but it's better to set multiple passes in your laser software than to rely on duplicate geometry you can't see.