BLTouch Smart V3.1 - Auto Bed Levelling Sensor: 2019 Edition - Cover Expand

BLTouch Smart V3.1 - Auto Bed Levelling Sensor

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The updated 2019 edition BLTouch Smart V3.1 caters to many minor problems of previous versions, while adding extra features for enhanced accuracy.

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After being in the industry of 3D Printing for so long, we’ve come to learn that only the very best brands can survive this cutthroat industry, and the brands that can’t quite cut it tend to slow down on the upgrades and new models that they produce, until eventually they stop altogether. This is why, when we find a brand like ANTCLABS, who continuously bring out new models, upgraded versions of their products, as well as improved firmware to handle some of the odd problems that arise from time to time, we like to support them to the fullest and keep up to date with the fantastic improvements that they keep on pumping out year after year.

The latest BLTouch Smart V3.1 Sensor is the 2019 Edition of the world-famous Bed Levelling Sensors, and is a great example of how ANTCLABS continues to update their products as the need arises. And in addition to the major improvements of increased compatibility and more consistent accuracy, the new 2019 BLTouch also features a range of other improvements too. These somewhat “minor” improvements that have been done to the BLTouch Smart V3.1 Sensor include the removal of the logic voltage manual selection, due to the 3.3V/5V free logic voltage capabilities, as well as a neater and slightly smaller form factor that gives the unit a sleek aesthetic style – something that we didn’t expect to like as much as we do.

For more in-depth details on this new model, as well as the differences between this model and the Classic, check out the ANTCLABS Product Page, which includes a good amount of information on the features, as well as Wiring Assistance and installation procedures for the BLTouch Smart V3.1 2019 Edition, as well as previous models.

Please Note: Some 3D Printers may require an additional BLTouch Extension Cable in order to reach all the way to the controller board. So be sure to measure twice before purchasing, as you may also need the BLTouch Extension Cable.


BLTouch Smart V3.1: 2019 Edition  -  Technical Specifications:

  • Operating Voltage

– 4.8V to 5.1V DC

  • Logic Voltage

– 3.3V OR 5V DC (Optional)

  • Current Consumption

– 15mA Standby | 300mA Peak

  • Manufacturer


  • Official Markings

– Serial Number + QR Code located on PCB

  • Smart V3.0/V3.1 Updates

– Optional Logic Voltage: 3.3V OR 5V

– 1.6mm Longer Pin Stroke

- Minor Electronics Improvements

  • Enclosure Material

– Polycarbonate

  • Cable Length

– 150mm (±5mm)

  • Wiring Specifications: 3-Pin

– Brown = - / GND | Red = +5V | Orange = Signal

  • Wiring Specifications: 2-Pin

– Black = - / GND | White = ZMin


BLTouch Smart V3.1 Auto Bed Levelling Sensor  -  Operational Specifications:

  • Sensor Type

– Contact / Touch                                                      

  • Standard Deviation

– ≤0.01mm (3D Printer Dependant)

  • Repeated Accuracy

– ≤1%

  • Bed Material Compatibility

– Any Materials (Metal/Glass/PEI/etc)


Typical Applications for the BLTouch Smart V3.1 Auto Bed Levelling Sensor:

The BLTouch Smart V3.1 is an all-round great tool that makes bed levelling simple, easy and automatic with the right settings. This allows you more time to focus on other factors that affect print quality, without having to waste any time adjusting the bed level or calibrating the Z-height before each and every print.

And finally, just to sweeten the already-amazing deal that these sensors offer, there is a surprisingly large online community that is always ready to help newcomers with a wealth of information, guides and insights for almost any 3D Printers on the market. So don't be scared to reach out, as you will not only find other like-minded individuals who are eager to help, but also a range of different articles and collections of knowledge and experience for you to utilise, which is invaluable in an open-source industry such as 3D printing.


Additional Resources:


HWPHSPALBLT - V3.1 Datasheet

HWPHSPALBLT - BLTouch V3.1 Datasheet

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This touch sensor is worth every sent, I would buy it again in a heartbeat.
I used washers instead of the springs to get my prefered height off the bed.

  • 3 out of 3 people found this review useful.

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BLTouch Smart V3.1 - Auto Bed Levelling Sensor

BLTouch Smart V3.1 - Auto Bed Levelling Sensor

ANTCLABS is a fantastic brand that was founded by the relatively famous South Korean Maker known as Paris Kyung-yeon Lee, who has won multiple awards for her efforts in inventing, Making and other intellectual property related projects. And after seeing a massive gap in the 3D Printing industry for reliable bed levelling sensors, she took on the task of creating the ultimate sensor that not only measures with precision accuracy, but even gets out of the way when not in use, so as to prevent any negative effects on the print while offering optimal accuracy.

Since founding the ANTCLABS brand, the BLTouch sensor has received global recognition as being one of the best, most affordable bed levelling sensors for hobbyists. Additionally, even though the original BLTouch was excellent, Paris made the effort to improve the design even further, and now, three iterations later with the BLTouch V3.0, it not only offers the amazing value that it did originally, but also so much more with an improved pin material, better compatibility and an even simpler level of usability.