Do I need to provide my Thai bank book for my marriage-based extension at Chiang Mai immigration?

Chiang Mai does NOT require you show an updated bank book when you go back to get the year extension inked in after the under consideration period on married to a thai extensions.

Just show up with the passport and the blue/green receipt showing you paid the 1900baht for the extension and they should in the 11 months into your passport no issues at all

Usually not ( I never had to show), but I always carry my bank book with me when I pick up my extension

As a general rule, there is no requirements for the seasoning of funds after the application is accepted in case of a 1-year extension based on being a spouse to a Thai national. But some offices might ask you to keep funds for a certain period during the under-consideration period. If you are worried, keep your funds and bring the updated passbook with you. In case they require you to have it, you need to update your passbook on the day you go to the immigration office to get the remaining 1 year.

Let's see if anyone in this group knows about the CM policy of funds requirements for an extension based on marriage to a Thai. OR post to ChiangMai-related groups, you may get the answer faster.