Can I extend a visa exemption for another 30 days at Chaengwattana with a Malaysian passport?

A user inquired about extending their visa exemption for another 30 days at Chaengwattana, mentioning the unlimited entry criteria for Malaysian passport holders. They wanted to know the necessary documents for the extension and whether an embassy letter is required. Responses confirmed that the extension is possible and listed necessary documents: 1900 baht fee, a copy of the passport data page, entry stamp, visa (if applicable), exit card, and one passport photo, along with the application.