No. It is up to the buyer to print and use the label - really, you have done your part by sending it to them.
Suggest they ask a friend to print it or try the local print shop or library.
If the buyer wants a return, they do have to make some effort!
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)