Go to https://claude.ai/chat/new (or any other chat you had in the past).
Then run this code:
function printClaude() { // (C) 2024 by ZeroWw. If you use this code, just give me some credit.
const centralPart = document.getElementsByClassName('mb-1 mt-1')[1].parentElement.parentElement.parentElement.parentElement;
if (centralPart) {
// Create a new window for printing