The BX3-21 is a compact, highly flexible 2-inch (up to 60mm) open frame, Direct Thermal kiosk printing mechanism. Designed for standalone self-service kiosk installations, where space is limited the low profile mechanism with flexible mounting options is ideal for today’s latest generation of slimline kiosks.

This highly reliable printing mechanism operates at print speeds of up to 250mm per second with 203dpi resolution to product high quality text, graphics and barcodes. Presenting a larger paper roll capacity than traditional packaged kiosk printers, the BK3-21 support media roll diameters of up to 120mm and various media widths of 60 / 58 / 20mm for a range of printing applications from receipt and ticketing to narrow token printing. While supporting paper saving features to reduce paper consumption up to 25%, alongside decreased CO2 emissions.

Featuring a compact, lightweight design, the BK3-21 offers flexibility to kiosk builders by supporting a range of kiosk mounting options thanks to its intuitive power/reset buttons located on either side of the printer. Ideal for unmanned kiosks, the mechanism’s low maintenance, open frame design with easily adjustable paper guide and numerous customizable bezel options offer simple printer customization. While operating in temperatures between -20~60℃ (-4~140℉).

Providing multiple connectivity options including USB (V2.0 Full Speed) and Serial (9P-Male, 5P-Connector), the BK3-21 is also supported by BIXOLON’s wide range of drivers, utilities and SDKs. The BK3-21 is compatible with Windows® major OS system and OPOS-based systems from Android™, Windows® and Linux™ for smart based devices.


  • 2-inch (up to 60mm) Direct Thermal open frame, compact kiosk printer mechanism
  • Fast print speed up to 250mm per second at 203dpi high quality print resolution to produce text, graphics and barcodes
  • Supporting selectable media widths: 60/58/20mm
  • Large paper roll capacity: Media roll diameter of 120mm
  • Compact and lightweight allowing a range of kiosk mounting options
  • Power switch and reset button available on both sides of the printer making it easy to reboot
  • Resistance to harsh environments to provide long term reliable operation
  • Easily adjustable paper guide and customizable bezel options
  • Operation in temperatures between -20~60℃ (-4~140℉)
  • Supporting numerous bezel options including: No Bezel, Standard Bezel (Upper & Lower Split), Standard Bezel (Upper & Lower Fixed), Standard Bezel (Upper Only) and Standard Bezel (Lower Only)
  • Multi-position Near-End Sensor for efficiently monitoring the status of the paper
  • Accompanied by a comprehensive range of drivers and SDKs (Software Development Kits) for quick and simple integration
  • Connectivity options: USB (V2.0 Full Speed) + Serial (9P-Male, 5P-Connector)
  • 2 year warranty as standard


Print MethodDirect Thermal
Print SpeedUp to 250 mm/s
Print Resolution203 dpi
Print WidthBK3-21: 54 / 48 / 12 mm
SensorPaper End, Cover Open, Near End, Black Mark
Media TypeReceipt
Media WidthBK3-21: 60 / 58 / 20 mm
Media Roll DiameterUp to 120 mm
Media Thickness0.05 ~ 0.12 mm
Supply MethodEasy Paper Loading
Dimensions (WxLxD)BK3-21: Media Roll Diameter Φ80: 109 x 130 x 91 Media Roll Diameter Φ102: 109 x 137 x 99 Media Roll Diameter Φ120: 109 x 144 x 105
WeightBK3-21: 600 g
Electrical100-240V AV, 50/60Hz
Lever DirectionBK3-21: Right
Mount DirectionHorizontal / Vertical
NV Image Memory256 Kbytes (Mono)
Receive Buffer64 Kbytes
User Define Buffer12 Kbytes
InterfaceStandard: USB (V2.0 Full Speed) + Serial Optional: USB (V2.0 Full Speed) + Serial
Connector TypeBK3-21: USB B(Default) Serial: 9P Male or 5P Connector
TemperatureOperating: -20 ~ 60℃ (-4 ~ 140℉) ※ Optimal printing performances and maximum reliability will be obtained between 0 and 40°C Storage: -20 ~ 60℃ (-4 ~ 140℉)
HumidityOperating: 10 ~ 95% (non-condensing) Storage: 10 ~ 95% (non-condensing) excluding paper
Thermal Print Head (TPH)100 km
Auto Cutter1.5 Million Cuts
EmulationBXL / POS
Driver / UtilityWindows Driver, OPOS Driver, Linux / Mac CUPS Driver, Utility Program
SDK/PluginAndroid SDK, Windows SDK, Linux SDK
Character SizeFont A: 12 x 24 Font B: 9 x 17 Font C: 9 x 24 KOR, CHN, JPN: 24 x 24
Characters Per LinePrint width 72 mm : Font A: 48 Font B, C: 64, KOR, CHN, JPN: 24 (BK3-31 only) Print width 54 mm : Font A: 36 Font B, C: 48, KOR, CHN, JPN: 18 Print width 48 mm : Font A: 32 Font B, C: 42, KOR, CHN, JPN: 16 Print width 12 mm : Font A: 8 Font B, C: 10, KOR, CHN, JPN: 4
Character SetsAlphanumeric: 95 Extended Graphics:128 x 35 page International: 32
GraphicsSupporting user-defined fonts, graphics, formats and logos
Barcode Symbologies1D: Coda Bar, Code 39, Code 93, Code 128, EAN-8, EAN-13, ITF, UPC-A, UPC-E 2D: Data Matrix, GS1-128, GS1 DataBar Stacked / Omnidirectional / Truncated / Limited / Expanded, PDF417, QR code
Option BezelBK3-21: Non-Bezel / Separated-Bezel / Fixed-Bezel, BK3-21: 60 / 58 / 20 mm Media Thickness: 0.05 ~ 0.12 mm
Accessories OptionalSMPS (DC Jack), SMPS (2P Connector), Male to Male type Serial Cable, 5P to Male type Serial Cable, USB A-B Cable 1.8m, Power Cord