Prints come out blank or unreadable

A label that comes out blank, with garbled characters or cut off is almost always one of two things: the printer needs to be calibrated, or the connection dropped for a moment. You don’t have to pick anything technical — the app finds the right settings on its own.

Fix it in order

1. Check the paper and the printer light

   Make sure there’s still roll left, that the lid is fully closed, and that the printer light is steady blue (not blinking). Many thermal printers turn a light red when the roll runs out.

2. Give it a few seconds to reconnect

   If nothing came out, the connection may have dropped for a moment. Reconnecting is automatic — wait a few seconds with the printer on and nearby, then print again.

3. Run the printer Assistant

   In Printers, open the printer and tap Assistant. It finds the right settings on its own (model, roll size, density) — you just confirm. This is what fixes blank, garbled or misaligned labels in most cases.

4. Print a test to check

   Still in Printers, tap Print test. If the test label comes out clean and aligned, you’re done. If it still looks off, run the Assistant once more.

When it’s the connection

If the printer disappears from the list or errors out when printing, the problem is the link, not the settings. Thermal printers use Bluetooth Classic (SPP) — the same everyday Bluetooth used by headphones and speakers. See Reconnect the printer and, if it doesn’t even show up, Printer won’t connect.