Rhino 3D Tip: Rhino to Laser Cutter: Hairline Vector Cut Setup

When sending Rhino geometry to a laser cutter, “hairline” strokes tell the driver to vector cut rather than engrave. Here’s how to produce clean, reliable hairline curves straight from Rhino, reduce charring, and avoid stalled jobs.

• Set units and tolerances first:
  • Match your shop standard (mm or inches) in File > Properties > Units.
  • Absolute tolerance: 0.01 mm (0.0004 in) or tighter. Angle tolerance: 0.1°.
• Keep it truly 2D:
  • Flatten curves with ProjectToCPlane or SetPt (Z only).
  • Use Planar while drawing to lock on the CPlane.
  • Check with SelCrv + BoundingBox: Z should read 0.
• Create a real hairline width:
  • Document Properties > Annotation > Print Widths: Add a custom width of 0.001 in (0.0254 mm) named “Hairline”.
  • Assign ByLayer Print Width = Hairline to your “CUT” layer; set Print Color = pure red (255,0,0) if your driver uses color mapping.
• Organize by operation and order:
  • Layers like 00_ENGRAVE, 10_SCORE, 20_CUT_INNER, 30_CUT_OUTER help sequence operations in many drivers.
  • Keep objects ByLayer for color and width consistency.
• Ensure curve quality:
  • Join segments (Join) and remove duplicates (SelDup > Delete).
  • SimplifyCrv to reduce micro-segments; Rebuild only if you can maintain accuracy.
  • Close tiny gaps with Extend, Fillet, or CurveBoolean; verify with ShowEdges > Naked Edges (on surfaces) or SelOpenCrv.
• Control start points for cleaner entries:
  • Use CrvSeam on closed curves to set a start position where a blemish won’t matter.
  • Prefer inside cuts before outside profiles to prevent part shift.
• Corners, speed, and burn:
  • Very sharp corners slow the head and char material; add small Fillet corners where possible.
  • Use SelShortCrv to find tiny stubs that cause pause/burn events.
• Text and graphics:
  • Create text with TextObject as Curves (not surfaces) for cutting or scoring.
  • Explode and Join as needed; keep counters (holes) closed and on the correct layer.
• Export or print reliably:
  • Direct print: Print > Vector output, 1:1 scale, select your laser driver, disable raster unless engraving fills.
  • DXF: Use R12/LT2D; convert splines to arcs/lines (Convert + SimplifyCrv) if your controller dislikes splines.
• Compensate kerf and test:
  • Measure kerf and Offset your cut paths by half the kerf to maintain nominal sizes.
  • Run a small coupon on scrap to lock settings before the full sheet.

Pro tip: Save a laser template with units, tolerances, custom “Hairline” width, standard layers, and display colors so every job starts ready to cut. If you need Rhino licenses, add-ons, or guidance, the team at NOVEDGE can help you configure a robust laser workflow. Explore Rhino and complementary plugins at NOVEDGE, and check their insights on the NOVEDGE Blog.

You can find all the Rhino products on the NOVEDGE web site at this page.