Tenho usado essa e funciona bem 😉
<script language="JavaScript" type="text/JavaScript">
<!--
function chromePrint(){
print();
}
function chromePrintDelay(){
setTimeout("print()", 500);
}
var browserName=navigator.appName;
if (browserName=="Microsoft Internet Explorer")
{
window.print();
}
else
{
if (browserName=="Netscape") //google chrome app.Name
{
chromePrintDelay();
}
else {
window.onload = window.print; // helps with Opera
}
}
//-->
</script>
