Converting .obj to .dxf format

Good day!
Guys, tell me what programs can convert obj files to dxf format?

Cad Exchanger website link removed by mod. Now depends of the obj model complexity sometimes can result in messy DXF file.

DXF is short for Drawing Interchange Format or Drawing Exchange Format. Commonly known as AutoCAD DXF format, is a CAD data file format

This dxf will be used for crystal 3d laser printing.
I need a cloud of dots for printing with a laser in a crystal

you can contact with an expert who can help you in this case.