How to Prepare Files for CNC & Laser Cutting

Preparing Files for CNC and Laser Cutting

Providing correctly formatted design files ensures your parts are cut accurately and avoids costly delays. Whether you are submitting files for CNC routing or laser cutting, following these guidelines will help your project run smoothly.

Accepted File Formats

We accept DXF, DWG, AI, PDF, SVG, and STEP file formats. DXF is the preferred format for CNC routing as it preserves exact geometry and dimensions. AI and SVG work well for laser cutting, particularly for signage and decorative work. STEP files are ideal for 3D machining operations. Always ensure your files are drawn at 1:1 scale in millimetres.

Design Guidelines

Use closed polylines or paths for all cut profiles: open paths and overlapping geometry will cause machine errors. Convert all text to outlines or curves before exporting. Remove duplicate lines, construction layers, and dimension annotations from your cutting file. Separate cut lines, engraving lines, and fold lines onto different layers or use different colours.

Minimum Feature Sizes

For CNC routing, the minimum internal radius equals the radius of the cutting tool (typically 1.5mm–3mm). Minimum slot width is the cutter diameter. For laser cutting, minimum feature size depends on material thickness: as a general rule, features should be no smaller than the material thickness. Bridges and tabs narrower than 2mm are fragile and may break during cutting.

Common Mistakes to Avoid

The most common file issues we see are: drawings not at 1:1 scale, text not converted to outlines, open or overlapping paths, missing dimensions, and files saved in incompatible formats (such as JPEG or PNG, which cannot be used for cutting). Taking a few extra minutes to check your file before submission will save time and ensure accurate results.