Can a tourist with a multiple re-entry visa get an extension at Chaeng Wattana or must he do a visa run?

The user inquired whether their friend, holding a multiple re-entry tourist visa, can get an extension stamped at Chaeng Wattana or if a visa run is necessary. Responses clarified that the friend can extend the visa by 30 days at the immigration office for 1900 THB but must be present in person for the extension, as they take a digital picture. An alternative option is to perform a visa run to another country to receive a new entry stamp.