What documents are needed for a visa extension in Thailand, and which immigration office should I visit?

The post discusses the need for a visa extension as the user wishes to avoid a border run. They seek answers about which immigration office to visit and the necessary documents for the extension. Responses suggest contacting the local immigration office for specific requirements, emphasizing the importance of having original application paperwork and mentioning a bank balance requirement. There's also a debate about the timing of the extension application, with advice both for doing it early and caution against last-minute applications.