Hi laplanteapplianc,
The option to print receipts using the portable 55mm printer is through QuickBooks Point of Sale. You can visit our website or you contact our sales representative to talk about it for more details : .https://quickbooks.intuit.com/point-of-sale/pos-software/.
In QuickBooks Online, we currently don't have a way to do it. Please refer to this article for more info: How to Print Sales Forms.
Let me know if there's anything else you need. We're happy to help.
