Hi budgie
check this seems to be the answer from epson FAQ related to your printer
Selected FAQ
Q:
I installed the driver in Mac OS 9.x (9.1 or later), but it isnt showing up in the Chooser. What should I do?
A:
Make sure the QuickDraw GX extension and any other unnecessary extensions are disabled, and make sure the CX4600 and EPSON Monitor IV extensions are enabled. Then restart your Macintosh.