I'm having the EXACT same issue. On 10.10.3, with a wirelessly connected Epson printer. Been printing to it for years....no problems....great printer. Now, after the 10.10.2 update, printing has been a mess. Most of the time, my Macs on my home network do not see the printer and I have to power cycle it to get it to work.
I've tried:
- Resetting the printing system.
- Disconnecting and reconnecting the printer to my wireless network.
- Removing the printer, and re-adding it via preferences. (confirming that I have the most current software)
- Downloading the Epson drivers and installing.
- Re-adding as an AirPrint printer.
- Re-adding as a printer by selecting the model from the drop down.
- Installing the latest firmware for my printer.
So far, nothing is fixing this issue, and the only thing that has changed is my upgrade to 10.10.2.
**One additional thought** - I've got a current generation AirPort Extreme. Perhaps it automatically updated itself and is now somehow blocking or manipulating printing traffic???
Additionally curious:
- Using my browser, I can still connect to the printer administration page by entering in it's IP address.
- I can see the printer's onboard storage from the Finder. It appears as a windows share.
- My wife's old iMac is running OS X 10.8, and is having this issue as well. So I'm thinking maybe it's the AirPort. ??
So it's like the printing traffic is being blocked, but other services are available! ??