http://www.morfon.com/epson-photo-printer-ink-refills/

Epson Sylus Photo R300?
Refill ink Cartridges: Help, I refilled my Black(T0485) and Cyan(T0482) ink cartridges. Now my printer still indicates that ink is out. Why? I did a successful refill so why it still show “ink out’ and does not work?
You need an Epson chip resetter in order for these cartridges to work properly. You can order one online for about $10 here: http://www.castleink.com/_Ink-Refill-Kits.html