Star Micronics portable Bluetooth Receipt Printer SM-T300i is used with FuelMor Driver App v2 (FDA v2) on bobtails that do not have LCR registers. 

Source (optional):
BarcodesInc.com


Thermal paper for SM-T300i printer:
Source: American Business Forms


About

Hardware Manual


SDK and Documentation


How to change the emulation


Test Print

1. Ensure the printer’s power is OFF.
2. Turn the printer power ON by simultaneously holding down both the FEED and POWER buttons.
3. Release the FEED and POWER buttons ONLY when printing begins.
4.
 Remove Self-Test page after printing completes.

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In Star Micronics portable printers like the 
, "reprint" functionality often fails after a firmware update to version 5.1 due to the printer defaulting to ESC/POS emulation rather than StarPRNT emulation.
In ESC/POS mode, certain proprietary Star features, including specific reprint triggers or memory storage for reprints, may be disabled or ignored. 
Star MicronicsStar Micronics +1
How to Fix Reprint Issues on Firmware 5.1
  1. Check Current Emulation: Perform a self-test by powering the printer OFF, then holding both POWER and FEED until it starts printing. Look for the "EMU" line; if it says "ESC/POS," the reprint function may not respond as expected.
  2. Switch to StarPRNT Emulation:
    • Power the printer ON and open the paper cover.
    • Press and hold the POWER and FEED buttons simultaneously.
    • Wait for the ERROR lamp to flash five times, then release both buttons.
    • Close the paper cover. The printer should automatically print a confirmation receipt showing "EMU = StarPRNT".