My last Non-O multiple entry 90-day stamp expired this month, so I traveled to the Wang Prachan border in Satun to obtain a 60-day Visa Exempt.
I explained that I wanted to return on the same day and was informed that a fee of 2000 baht was required.
After paying the fee, I received a ticket number which I had to present on the Malaysia side and again on the Thai side upon arrival.
Everything went smoothly. I inquired about the frequency of doing this, and I was told that currently, I can do it as many times as I want, but the rules may change in the future.
I hope this information is helpful to some of you!