Javier,  This silly forum no longer supports private messaging a user, so it's rather impossible for me to "email you" to learn how you solved this problem.  We have a thermal printer (much like what you see in Home Depot, Target, Walmart, etc) and it worked flawlessly in Quickbooks Desktop.  Now that we've converted to Quickbooks Online it will no longer print out receipt.. I remember we have to customize a template in Desktop to make everything right, but I don't see the same configuration options in Online...

How can you send me your solution?  I'd hate to post my email address here to have it scraped to high heaven...

Thanks in advance..

Larry