What experiences have expats had with obtaining a re-entry permit at Chiang Mai airport before departure?

Several expats shared their experiences regarding re-entry permits at Chiang Mai airport, indicating it can be quick and simple if all paperwork is in order. However, one commenter pointed out that the re-entry permit desk may not open early enough for early morning flights, causing potential delays. Another advised that it's safer to obtain a re-entry permit at the Chiang Mai immigration office to avoid possible risks such as unexpected closures and lack of necessary documents.