I purchased a Qunsuo QS PDA/printer, which has been developed, but can only print one small ticket at a time, how to achieve multiple printing?

First, you can use a for loop or a thread to print multiple times (there is a previous example of using the for statement to print 500 QR codes in a continuous loop).

But need to pay attention: Due to the limited cache of the PDA/printer, delay processing is required between printing two receipts to avoid garbled characters. 

The standard for this delay generally depends on the time to print a small ticket. For example, if a small ticket is 2000ms, then the delay is 3000ms.