best results are if you print to file through laserwriter as you can control the dpi, page size, colour matching etc
this allows you to print (plot) at what size your plotter driver will allow
going through pdf writer allows only 288 dpi and max size 1100mm x 1100mm or there abouts
best method for plotting from bureaus etc around and ditributing to clients
also allows to keep electronic file records, pdf files generally significantly smaller than original can't be altered etc
set up multiple page documents to avoid file opening/down load fee