What forms do I need for my visa extension application in Thailand?

The user is preparing to apply for a visa extension in Thailand and is inquiring about necessary forms to bring to the immigration office. They mention having their TM7 form, a copy of their passport, their TM30, and payment. Comments suggest bringing additional documents such as a copy of the passport data page, the arrival stamp page, and two passport-sized photos. It is also noted that one must go to the immigration office where the TM30 is filed.