Just because Apple sends updates doeesn't mean you have to always download them.
Also, updating an application shouldn't affect any OS X printing capabilities unless it it a direct OS X upgrade, like from OS X 10.8.5 to OS Z 10.8.6.
If any of the software updates mention updating Epson printing drivers, that's another story and you can keep that particular update from happening.
If you go into OS X Prefences Pane, locate the Software Update icon and click it.
A pop up window appears and asks you to check for updates.
If your Mac detects the presence of updates from Apple's servers,
Another window pops up and says Updates available.
Click on Show info or Show updates.
A list of software updates appears.
There are small checkboxes next to each update.
Uncheck the updates that you DON'T want software update to update.