User blog comment:LittlePeng9/Random Turing machines/@comment-73.235.194.108-20170415160044

Here is one I made:

0 _ 1 r 0

0 0 1 r 0

0 1 0 l 0

I call it the one-trailer. It will start making a trail of ones, but when it runs into a one it didn't create, it will go back and erase its trail (and any ones before it), and when complete, it will start its trail again.