Why 3D Models Can't Be Directly Laser Cut?

Laser cutting is an efficient 2D sheet process, yet many customers submit 3D models (STEP/IGES) expecting "direct cutting." In practice this causes missing holes, incorrect dimensions, material waste and assembly issues. This article explains why and provides practical design and engineering unfolding (flat-pattern) tips to reduce rework and cost.

• Laser cutting is a 2D process: machines cut flat outlines. A 3D model contains bends, thickness and 3D features but not a flat unfolded contour (flat pattern).
• Missing flat pattern data: 3D files usually lack bend compensation, K-factor and the changes to hole positions caused by bending, so cut parts won’t match formed 3D dimensions.
• Non planar features: 3D local forms (stretches, chamfers, curved transitions) alter boundaries or hole geometry when flattened and must be handled by an engineer.
• Kerf and manufacturing tolerance ignored: 3D models often don’t account for kerf width or process tolerances that affect fit and assembly.

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