A duplicate line consists of two vector paths in the same position. Normal view often shows just one line, while the file contains two instructions. Those can add laser time and heat.
Where do duplicates come from?
They can appear when you paste a part twice, import the same geometry from different files or draw an outline over an existing shape. The boundary of an engraving shape can also remain as an unintended separate path.
Find the hidden overlap
Work in outline or node view. Select a suspicious line and temporarily move it. If another line remains in its place, you have found an overlap. Undo the movement before cleaning up.
In AutoCAD, OVERKILL can find duplicate and overlapping geometry. Check its colour and layer options so you do not remove a path intended for a different operation.
Paths and filled engraving shapes need different treatment
Delete the redundant path when cutting or engraving lines are duplicated. Combine overlapping closed shapes into the area you want engraved, while preserving openings that should remain unengraved.
When placing separate parts in one file, follow the spacing in the drawing guidelines. Do not simply push parts together so their edges overlap.
Check the cleaned-up shape
Compare contours, holes and engraving areas with the original and upload the new version. A clean file gives you more control and avoids unnecessary operations. For further savings, read about cost-effective design.