These printers use the TN880 cartridge:

Brother DCP L-6600 DW

Brother HL L-6200-DW

Brother HL L-6200-DWT

Brother HL L-6250-DW

Brother HL L-6300-DW

Brother HL L-6400-DW

Brother HL-L 6400-DWT

Brother HL L-6250 DN

Brother HL L-6300 DWT

Brother HL L-6400 DWG

Brother HL L-6400 DWX

Brother MFC L-6700-DW

Brother MFC L-6750-DW

Brother MFC L-6800-DW

Brother MFC L-6900-DW

Brother MFC L-6800 DWT

Brother MFC L-6900 DWG

Brother MFC L-6900 DWT

Brother MFC L-6900 DWX

Brother MFC L-6950 DW