Creality BL Touch V3.1 Auto Bed Leveling Sensor Kit - Precise Bed

In this review of the Creality BL Touch V3.1 sensor kit the bottom line is clear: this accessory is for owners of Creality printers with a 32 bit V4.2.2 or V4.2.7 mainboard who want accurate, automated bed leveling without flashing via ISP. It delivers the single biggest advantage of steady first-layer results by automatically measuring bed tilt and compensating the Z axis, with advertised precision of +/- 0.005mm. The kit focuses on compatibility and convenience: firmware can be upgraded via TF/SD card and the sensor includes multiple mounting brackets for common Creality Ender and CR series models.

Key Features

• Wide compatibility: Works with Ender 3, Ender 3 V2, Ender 3 Pro, Ender 3 Max, Ender 5 and Ender 5 Pro when those machines have a 32 bit V4.2.2 or V4.2.7 mainboard, so owners of those models can add auto bed leveling.
• Easy firmware upgrade: Firmware files can be copied to a TF/SD card from the Creality official site and inserted into the printer to update without using an ISP burner, simplifying the update process.
• Multiple mounting options: The kit includes three different brackets, allowing the small BL Touch sensor to be attached to several Creality printer frames without custom machining.
• High precision leveling: The sensor claims enhanced leveling accuracy to about +/- 0.005mm, enabling finer Z-axis compensation for more reliable first layers.
• Automatic Z compensation: The probe measures bed inclination and automatically compensates the Z axis during prints, which helps avoid failures caused by uneven beds.

Who It's For

This kit is aimed at Creality users who run one of the supported printers with a 32 bit V4.2.2 or V4.2.7 motherboard and who want a straightforward upgrade path to automatic bed leveling. It is particularly useful for hobbyists and small workshops that need more consistent first layers and prefer firmware updates via SD card rather than more technical flashing methods.

It is not suitable for printers that do not have a compatible 32 bit board or for users who need a plug-and-play guaranteed solution across every Ender variant; some customers report mixed reliability on certain models, so those needing mission-critical uptime or who are uncomfortable with occasional troubleshooting should consider alternatives or prepare for hands-on setup.

Pros & Cons

Pros

• Provides automated bed leveling that often improves first-layer reliability and print consistency.
• Firmware upgrade via TF/SD card avoids the need for an ISP burner, making updates more convenient.
• Multiple mounting brackets increase compatibility with different Creality frames.
• High advertised precision (+/- 0.005mm) supports fine Z-axis adjustments for small-layer prints.

Cons

• Some users report mixed functionality and occasional random failures on certain models, notably reported on Ender 5 variants.
• The sensor and mounting hardware can feel delicate, so care is required during installation and wire routing.

Specifications

Product name	BL Touch V3.1 Auto Bed Leveling Sensor Kit
Compatible printers	Ender 3 V2, Ender 3, Ender 3 Pro, Ender 3 Max, Ender 5, Ender 5 Pro, CR-10
Required mainboard	32 bit V4.2.2 or V4.2.7
Firmware update	TF/SD card update using Creality firmware (no ISP burner)
Included mounts	Three different mounting brackets
Leveling precision	About +/- 0.005mm

Our Verdict

The Creality BL Touch V3.1 kit is a sensible upgrade for owners of supported Creality printers who want more consistent first layers and easier firmware updates. It offers precise leveling, multiple mounts, and SD-based firmware installation, making it good value for tinkerers and regular users; however, buyers should be prepared for occasional setup work and be aware of mixed reports on long-term reliability for some models.

Frequently Asked Questions

Will this work on my Ender without changing the mainboard?
This kit requires a 32 bit V4.2.2 or V4.2.7 mainboard, so it will not work on Ender printers that have a different board unless you upgrade the mainboard.

How do I update firmware for this sensor?
Download the CR-Touch firmware from the Creality official website, copy it to a TF/SD card, and insert it into the printer to perform the update without needing an ISP burner.

Are there known reliability issues?
Customers report mostly improved bed leveling but some mixed experiences with functionality and durability on certain machines; expect to troubleshoot wiring and mounting if problems appear.