Epson Stylus Photo 870 Printer Basics Manual page 39

2. Roll the edge of the paper backward to uncurl it. Use a folded sheet of paper or
the plastic sheet included with the roll paper holder to prevent your hands from
marring the printable surface.
3. Remove the printer's paper support and install the roll paper holder in the same
mounting slots. (The sides of the holder are marked R and L to indicate its right
and left sides.)
4. Now insert the roll paper onto the holder's spindle, making sure both are oriented
as shown here. Then insert the spindle into the roll paper holder.
4-inch wide roll paper
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13-inch wide roll paper