Experimental driver kit for some Casio label printers by Daniel Amkreutz. See the documentation coming with the driver source code for the full list of supported devices.

Evidently these printers are not USB printer-class devices, so this driver includes a libusb-based userspace USB driver program. Ultimately it accepts a 512x64 bitmap in xbm format.

Alternatively there is a CUPS backend and companion ppd with converter script.

There are no Foomatic, LPR, PDQ, PPR, ... integrations for this driver.