BIGTREETECH BL Touch V3.1 Auto Bed Leveling Kit - Precise Probing

In this review the BIGTREETECH BL Touch V3.1 kit is assessed for hobbyists and small workshop users who want a compact, high-precision auto bed leveling sensor for Ender and CR series printers. The single biggest reason to buy is its repeatable probing and Hall effect control that enables accurate leveling on a variety of bed surfaces; the probe claims a standard deviation around 0.005mm and a longer 1.6mm stroke versus prior versions, which directly improves first-layer consistency. The package also includes two extension cables to suit common printer layouts.

Key Features

• High-performance sensor: Hall effect control delivers consistent triggers so the printer can detect subtle bed height differences across glass, wood, and metal surfaces.
• Longer probe stroke: The V3.1 probe extends approximately 1.6mm farther than older models, providing additional travel for reliable contact on warped or raised beds.
• High precision repeatability: A quoted standard deviation near 0.005mm helps produce a stable first layer and reduces the need for manual fine tuning.
• Logic voltage selectable: Open drain output supports both 3.3V and 5V logic, with the desired voltage stored in probe EEPROM and selectable by command for compatibility with different control boards.
• Two extension cables included: A 1.5m cable for larger frames like CR10 and a 1.0m cable for Ender series simplify wiring without immediate need for extra parts.

Who It's For

The BL Touch V3.1 kit suits Ender 3, Ender 5, CR-10 owners and anyone using compatible 32-bit boards such as BTT V4.2.7, SKR Mini E3 V3, Octopus, Manta and similar controllers who want automated mesh bed leveling and more reliable first layers. It is also a good match for users who need a probe that works on a range of bed materials and value a compact sensor footprint.

It is less ideal for complete beginners who expect step-by-step printed instructions in the box; several users reported limited documentation and some mixed experiences with wiring and functionality. Advanced users who are comfortable flashing firmware and checking wiring will find the kit most straightforward to integrate.

Pros & Cons

Pros

• Compact and easy to fit on common hotend assemblies, improving clearances and aesthetics.
• Precise probing with very low repeatability deviation, which helps first-layer quality.
• Includes two extension cables for Ender and CR10 class printers to reduce immediate wiring hassle.

Cons

• Cable length can still be judged too short by some users depending on routing and case layouts.
• Some buyers reported mixed functionality and limited included instructions, so troubleshooting may require online resources.

Specifications

Our Verdict

The BIGTREETECH BL Touch V3.1 kit is a practical upgrade for hobbyists and makers who want dependable auto bed leveling and tight repeatability without a large footprint. It presents strong value when paired with compatible 32-bit boards and saves time tuning first layers, though buyers should be prepared to reference online setup guides if they need wiring or firmware assistance.

Frequently Asked Questions

Is this probe compatible with Ender 3 series?
Yes, the kit includes a 1.0m extension cable for Ender printers and is listed as compatible with Ender 3, Ender 3 V2 and related models.

Can the output logic be changed to match my board?
Yes, the open drain output supports 3.3V or 5V logic and the desired setting is stored in the probe EEPROM and selectable by command.

Does the package include everything needed for installation?
The kit includes the BL Touch V3.1 sensor and two extension cables, but users may need mounting hardware or firmware updates specific to their printer and controller board.