🚀 go-pugleaf

Bruce, 

      Real good actually except that I'm noticing a trim of about 4 mm of artwork
      all along the edges of where all four papers meet




What does that mean? Do you have a 4 mm white, unprinted border around each sheet? Or is it printing borderless, but it is enlarging the image slightly so that you are losing 4 mm of the printed image beyond the 8.5" x 11" paper size? 

      This throws off my poster as a misalignement on where angles in meet in
      the artwork is noticeable.




No idea what you mean here.

But, assuming your printer can print borderless (can it?), you need to select "borderless" in the printer's print dialog box. And you don't want it to "stretch" the image beyond the edge in any way. Your printer may not be able to do this accurately for tiling. You may have to print out either on larger paper (if your printer can handle it) or create more (and smaller) tiles to piece together. Or go to Kinkos or other storefront printer and have them run it out for you in one piece.

Neil