I came along this app for iOS. It seems to be possible to fill in a TM6 and print it before arriving/departing. Anyone tried this? Might safe some time for frequent travelers. Would even be better if you could submit it online and scan upon arrival.
TLDR : Answer Summary
The post discusses an iOS app that allows users to fill out and print the TM6 immigration form prior to arriving or departing Thailand. The author is curious if anyone has tried using this app and suggests it could save time for frequent travelers, while also expressing interest in the possibility of online submission for scanning upon arrival.