# BLTouch Clone only works sometimes (rarely)

**URL:** <https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527>\
**Category:** General Discussion\
**Created:** [November 12, 2023, 1:10pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527 "2023-11-12T13:10:43Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![pcace](https://avatars.discourse-cdn.com/v4/letter/p/b782af/32.png) [@pcace](https://klipper.discourse.group/u/pcace)\
**Post date:** [November 12, 2023, 1:10pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/1 "2023-11-12T13:10:43Z")

</div>

### Basic Information:

Printer Model: AnyCubic I3 Mega  
 MCU / Printerboard: Raspberry Pi / TriGorilla  
 [klippy.log](https://klipper.discourse.group/uploads/short-url/lQWZoigeQVIyFnDiJZm4aA64ciu.log) (50.4 KB)

### Describe your issue:

TLDR: BLTouch only works every ~10 tries

Hi there, i am trying to get a BL-Touch clone to work for BedMesh leveling.  
It is connected directly to the RPI with this configuration:

```auto
[bltouch]
sensor_pin: ^rpi:gpio0
control_pin: rpi:gpio27
z_offset: 2
x_offset: 12
y_offset: -25
#pin_up_touch_mode_reports_triggered: true
#probe_with_touch_mode: false

```

using the commands Sending BLTOUCH\_DEBUG COMMAND=pin\_up /down works perfectly everytime when the pin is not over the bed and can completely retract.

if the pin is above the bed and i trigger the pin to lower (BLTOUCH\_DEBUG COMMAND=pin\_down) it lowers as expected but goes directly to some kind of error state (blinks fast blue/red). in this state i cannot do anything until the pin is retracted again by BLTOUCH\_DEBUG COMMAND=reset. than i can do the same again.

when i do “PROBE” it lowers the pin but reports “BLTouch failed to deploy” and "Failed to verify BLTouch probe is raised; retrying.  
" then resets the pin and i can start it again without an actual measurement.

interestingly 2 times it did actually report a measurement. but current i cannot reproduce it.

reading the documentation i also went through BL-Touch “clones” section and tried  
pin\_up\_touch\_mode\_reports\_triggered and probe\_with\_touch\_mode with both fals and true without any change in the behaviour.

The Probe itself is around 2 millimeter above the nozzle in the retracted state.

What am i missing here? is there anything else i could check?

Cheers and thanks a lot!!

 ![IMG_3599](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/5/56409d1a66ad3db99e06c55286bfd42fb8e55526.jpeg)

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<div class="post-metadata">

**Author:** ![hcet14](https://avatars.discourse-cdn.com/v4/letter/h/ecd19e/32.png) [@hcet14](https://klipper.discourse.group/u/hcet14)\
**Post date:** [November 12, 2023, 1:25pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/2 "2023-11-12T13:25:25Z")

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> [@pcace](#):
>
> The Probe itself is around 2 millimeter above the nozzle in the retracted state.

I would move the probe a little bit up.

> [@Auto bed leveling with z limit switch](https://klipper.discourse.group/t/auto-bed-leveling-with-z-limit-switch/11450/4):
>
> ![room](https://global.discourse-cdn.com/free1/uploads/klipper/original/2X/2/29f4091710b7774cc391e75538a3b6d9f6d6f47c.png)

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<div class="post-metadata">

**Author:** ![pcace](https://avatars.discourse-cdn.com/v4/letter/p/b782af/32.png) [@pcace](https://klipper.discourse.group/u/pcace)\
**Post date:** [November 12, 2023, 1:51pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/3 "2023-11-12T13:51:33Z")

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Hi there,

thanks a lot! i did make it to work, but i am kind of unhappy with the accuracy.

> probe accuracy results: maximum 0.975000, minimum 0.802500, range 0.172500, average 0.868250, median 0.832500, standard deviation 0.067897

for me that looks like i might be more acurate by using the good old “paper-methode”

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<div class="post-metadata">

**Author:** ![Sineos](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/sineos/32/18_2.png) [@Sineos](https://klipper.discourse.group/u/Sineos)\
**Post date:** [November 12, 2023, 3:39pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/4 "2023-11-12T15:39:44Z")

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It seems your clone has a very bad quality. Typical standard deviation are at least a factor 10 smaller than your value, e.g. just tested on one of my printers:

```auto
 16:37:45 // probe accuracy results: maximum 2.232681, 
minimum 2.225971, range 0.006710, average 2.228405, 
median 2.228233, standard deviation 0.001997

```

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<div class="post-metadata">

**Author:** ![linuxpaul](https://avatars.discourse-cdn.com/v4/letter/l/f9ae1b/32.png) [@linuxpaul](https://klipper.discourse.group/u/linuxpaul)\
**Post date:** [November 12, 2023, 9:06pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/5 "2023-11-12T21:06:46Z")

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Maybe running 5V Hardware in 3,3V Pins?

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/klipper/original/1X/64419bf2aac6639e6ef5cef200dcd456b0a01ac3.png) [@system](https://klipper.discourse.group/u/system)\
**Post date:** [January 11, 2024, 9:07pm UTC](https://klipper.discourse.group/t/bltouch-clone-only-works-sometimes-rarely/11527/6 "2024-01-11T21:07:02Z")

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