Hmm… it seems to be working on our end.
Have you tried clearing your cache, or simply trying to print using a private/incognito window, or another browser?
What exactly is not working as expected?
Update: To be clear, the plugin is working on this page. It’s not working on this page because the target is, as you said: div#id_of_element_to_print
this needs to be adjusted to the ID of the element you want to print. Since the target element has no unique ID or class, you can only target the element as in the first example:
[print-me target="table" title="Print Schedule"/]
Are you able to assign a unique ID to the schedule table?