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I couldn't find a reliable source listing the improvements of BLtouch 3.1 vs 3.0.

I can see that BLtouch 3.0 is sold (original) for about 20 Euro, while 3.1 costs about 30 Euro. The difference is significant.

What are the improvements?

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Best reference would be the original equipment manufacturer (Antclabs). It appears their sensor has had many versions:

enter image description here

So, from 3.0 to 3.1 is a software upgrade. Reported highlights are:

★ Smart V3.0 (Mar. 2019 ~ ) : S10, S60, S90, S120, S140, S150, S160, PWM Wiring defect indication(Blue LED), QR, Molex 1.25, Plastic Push-pin(PC), Power Wiring defect indication(Red LED)

★ Smart V3.1 (Mar. 2019 ~ ) : S10, S60, S90, S120, S130, S140, S150, S160, PWM Wiring defect indication(Blue LED), QR, Molex 1.25, Plastic Push-pin(PC), Power Wiring defect indication(Red LED)

If you look at the manuals you will see the differences:

V3.0 enter image description here

V3.1 enter image description here

As can be seen, timings are different and more PWM position G-code options are available in the V3.1.

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