We are definitely on the right track here. One thing thou. Two windows come up after clicking the Print Me button.
Can you hide the window in the front until needed? The window in the back has the OK button that one must click then it will print the contents of the block as needed.
I had to make some small changes to button because it wouldn't work trying to add it to the Title field. <button onclick="print_elem('.bx-base-profile-entity-content');">Print me!</button>
print.png 