How can I extend my visa exemption in Thailand at IT Square, and what should I prepare?

An American expat shared their experience extending their visa exemption at the IT Square immigration office in Bangkok. They noted that, although online extensions are available, the in-person wait time was minimal, taking less than an hour. They arrived at 8:40 AM and found completing the TM30 form straightforward. The total fee for the extension was 1900 baht, and they advised bringing exact change as well as a passport photo and photocopies, which can also be prepared on-site.