Hello - success today extending 30-day Tourist stamped in on arrival at Lak Si immigration, third floor. Fortunately, I had booked an online appointment which I highly recommend doing. WITH appointment and proper documents, turned in 115pm, completed with passport return 200pm. Be advised the TM30 was checked and analyzed at IT SQUARE immigration 1 extension office.
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TLDR : Answer Summary
A user successfully extended their 30-day tourist visa at Lak Si immigration after booking an online appointment. They noted that having the proper documents and an appointment streamlined the process, allowing for completion within a couple of hours. The TM30 form was also checked during the extension application. Commenters shared experiences regarding the process and mentioned that extensions for visa-exempt stamps might not be processed at Chang Wattana anymore.