Allow exporting DS Mechanical to ArchD size drawings for large printouts

The export or printing does not currently allowing for mechanical files to be printed on 2 foot x 3 foot file formats.  I have saved these files to pdf and attempted to print to the 2' x 3' printouts but the distortion is terrible.  I went to  a place like OfficeMax or Staples.  Please create this option OR if it already exists, NO ONE has been able to tell me how to do it.