From CoMakingSpace Wiki
Drawing Interchange Format
|Software:||AutoCAD, LaserCut 5.3, Inkscape|
DXF (drawing interchange format) is a pretty old  file format to exchange 2D CAD files.
Caution: DXF files do not contain units of measurement! Make sure your import settings are correct.
Export from Inkscape
Exporting DXF is a regular task you are faced with when using Inkscape for laser cutting because LaserCut 5.3 does not accept SVG files.
- make sure to convert all objects (e.g. text) into paths
File --> Save as coy: use DXF R14 if your program supports this
- "Save as copy" should keep the original SVG intact in case you need to make adjustments to the design