I chose my printer in the Chooser, and it forgot my choice. 
The Chooser is counterintuitive, because you can use it to make several simultaneous choices (printer, network drives, etc.). As a result, it doesn't display what's chosen. Once you select a specific printer, it will remain chosen until you select a different printer (unless your backup battery is dead; see later). To confirm what printer is chosen, select Page Setup from the File menu—at the top of the window that's displayed, you'll see the name of your printer.
Early Epson Stylus printer software can cause the printer choice to be forgotten—update to a more recent version.
To choose a different laser printer (or other AppleTalk printer) click on the appropriate driver icon on the left side (such as LaserWriter or LaserWriter 8). Sometimes you have to scroll down to see the correct icon. The specific LaserWriter that you chose shows up on the right side and is highlighted. If it's not highlighted, you need to click on the printer name on the right side to choose it. If you are using a LaserWriter 8 or newer, there will be a little printer icon in front of the printer's name to show that you already "Setup" for that printer. If not, after highlighting the printer, click the Setup or Create button to select options for that printer. Then close the Chooser with the close box in the upper-left corner.
If you have an HP LaserJet or other non-Apple networked laser printer, pick LaserWriter 8 on the left side ...