I'm at Muang Thong Thani Immigration K Counter right now.

Today, they are "very serious about residence, Na". That's the TM30.

You HAVE to have the printed form if it was completed online by a landlord. If, like me, you're staying with friends in various places as you travel you have a lot more work to do. See below.

Your friend has to prove that you are staying with them. There are several ways they can do this but they seem to require some legwork. (I don't know what I'm going to do as my friend is working in Phuket until after my visa expires.) I've included pictures of the forms they'll require.

Also, there are new forms you're required to sign saying why you're staying (C-19 related) and that you understand the penalties of overstay.

EDIT: I added pictures of the new (to me) forms as well.