Hello there  @Advance Accounting. Thanks for getting back to the thread.

I appreciate you for dropping by here to know possible alternatives or the recommended apps for printing receipts with thermal 80mm printers. However, the Community team is unable to suggest a specific one. It's because each app has unique features and benefits.

Nonetheless, you may integrate some applications with QuickBooks Online that allow you to print using thermal printers.

I also suggest visiting this link to help you find the right apps for your business: QuickBooks App Store.

The following article will help you diagnose a wide range of PDF printing issues in Windows: PDF printing issues,

Feel free to click the Reply button below if you have further concerns about printing in QuickBooks Online. We're available 24/7. Have a great day!