Adobe Acrobat 3D is primarily used for creating, editing, and managing PDF files with 3D content, not for faxing documents. To send or receive documents using a Canon L120 fax machine, you would typically need to use the fax machine itself and ensure it is connected to a phone line. However, if you want to send a document from your computer using the Canon L120, you would need to have the document saved in a compatible format (such as PDF) and use a fax application or service that can send the file via your computer's fax modem (if available). Adobe Acrobat 3D does not have the capability to directly interface with fax machines or manage fax transmissions.