If all you need to do is border bounce on your year-long, multi-entry Non-O visa follow what
@Paul ********
, said. Go to any border, stamp out of thailand, stamp in&out of another country turn around and stamp right back into thailand to get another 90 day stamp.
What confused people was you saying you needed to go on a visa run :O
Here's how it works
Visa-run <- where you go to a thai consulate in another country and BUY a visa to thailand
Border-bounce <- where you go to the border, bounce out and back in to get another entry on a valid multi-entry visa OR to get a 30 day visa exempt entry stamp.