Digital BW, The Print

Here's the reply that I received from Epson:

START REPLY
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Thank you for taking the time to contact Epson.  It is my pleasure to 
respond to your inquiry.

The Stylus Pro 4800 has a cut sheet margin limitation of .116(3mm) 
inches top, left and right and .55(14mm) inches bottom. So your image 
will need to be small enough to fit within a 1.10 inches for a 
leading a trailing edge and .232 left ane right. The only way to get 
a truly even or "full bleed"
margin is through the use of roll paper.  The hardware is incapable 
of holding the paper and printing to the leading or trailing edge of 
the media. Unfortunately, due to the volume of output that was 
expected for the 4800 it is was designed to always have the .55 inch 
margin along the bottom of cut sheet. The printer hardware needs that 
much space to grip the paper allowing the proper feed step to produce 
Epson photographic quality prints.
The best way work around the margin limitation is through the use of 
roll paper.
Follow this key sequence on the front panel of the printer:

1) Press menu button twice.
2) Press the down arrow four times till you see "Paper margin"
3) Now press menu once, the selection should show "T/B 15mm"
4) Press the up arrow until you see 3mm then press "menu".
5) Now press pause and the printer will go to ready