Just to let people know what happened:
No problem. Required documents:
- Print out of my last 90 day report
- Print out of my TM.30 record
- Photocopy of the personal information, last extension, and last entry stamp pages from my passport
- Application form
- 200 baht.
My only grip is that it took so long. Last time I needed a residence certificate was at Mueang Thong Thani. There were separate queues for residence certificates and 90 day reporting. Now that it's back at Chaengwattana there's one queue. At MTT it took me five minutes. At CW I was waiting an hour and a half to be seen. (And whilst people doing 90 day reporting can book an appointment in advance, that's not possible for residence certificates.)
Of course, in a more developed country there'd be no need physically to make a four hour round trip for such an application when an email would suffice. But this is Thailand.
I did have to point out a couple of times that I'd only recently reentered the country, but that wasn't a big deal.