# Ender 3 pro btt skr mini v3 no mcu

**URL:** <https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994>\
**Category:** General Discussion\
**Created:** [February 14, 2025, 11:21pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994 "2025-02-14T23:21:52Z")\
**Posts on this page:** 10\
**Page:** 1

<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 14, 2025, 11:21pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/1 "2025-02-14T23:21:52Z")

</div>

### Basic Information:

Printer Model: ender 3 pro  
 MCU / Printerboard: big tree tech skr mini v3  
 Host / SBC  
 klippy.log

_Fill out above information and_ **_in all cases attach your_ `klippy.log` _file_** (use zip to compress it, if too big). _Pasting your_ `printer.cfg` _is **not** needed_  
_ **Be sure to check our “Knowledge Base” Category first. Most relevant items, e.g. error messages, are covered there** _

### Describe your issue:

…

im trying to get klipper to run on my ender but i keep getting a message on mainsail that mcu is unable to connect. im not sure what im doing wrong any help would be great

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<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 14, 2025, 11:41pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/2 "2025-02-14T23:41:14Z")

</div>

[klippy (2).log](https://klipper.discourse.group/uploads/short-url/hpKhAzLPmp4HNlopn0ROBRcjcUc.log) (501.8 KB)

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<div class="post-metadata">

**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [February 15, 2025, 6:57am UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/3 "2025-02-15T06:57:18Z")

</div>

Hello @bsavage710 !

> [@bsavage710](#):
>
> im trying to get klipper to run on my ender

Did yo follow a certain guide?

How did you obtain the serial ID?

```auto
[mcu]
serial = /dev/serial/by-id/usb-Klipper_Klipper_firmware_12345-if00

```

---

<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 15, 2025, 6:21pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/4 "2025-02-15T18:21:42Z")

</div>

i fixed it reflashed firmware to ender 3 pro then everything just worked. thank you for responding.

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<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 15, 2025, 7:56pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/5 "2025-02-15T19:56:59Z")

</div>

im stuck on bed mesh its not working properly itll fail mid way i have bl touch set up

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<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 15, 2025, 7:59pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/6 "2025-02-15T19:59:46Z")

</div>

```auto
[stepper_x]
step_pin: PB13
dir_pin: !PB12
enable_pin: !PB14
microsteps: 16
rotation_distance: 40
endstop_pin: ^PC0
position_endstop: 0
position_max: 230
homing_speed: 50

[tmc2209 stepper_x]
uart_pin: PC11
tx_pin: PC10
uart_address: 0
run_current: 0.580
stealthchop_threshold: 999999

[stepper_y]
step_pin: !PB10
dir_pin: !PB2
enable_pin: !PB11
microsteps: 16
rotation_distance: 40
endstop_pin: ^PC1
position_endstop: 0
position_max: 230
homing_speed: 50

[tmc2209 stepper_y]
uart_pin: PC11
tx_pin: PC10
uart_address: 2
run_current: 0.580
stealthchop_threshold: 999999

[stepper_z]
step_pin: PB0
dir_pin: PC5
enable_pin: !PB1
microsteps: 16
rotation_distance: 8
endstop_pin: probe:z_virtual_endstop
position_max: 250
position_min: 0

[bltouch]
sensor_pin: ^PC14
control_pin: PA1

## Offset for Hero Me 6
x_offset: -40
y_offset: -16
z_offset: 1.700 # Uncomment if starting fresh; Distance should be enough to keep the z-offset positive.
speed: 3.0
samples: 2
samples_result: median
sample_retract_dist: 6.0
samples_tolerance: 0.02
samples_tolerance_retries: 5

[bed_mesh]
speed: 120
horizontal_move_z: 1.700
mesh_min: 14, 14
mesh_max: 100,100 #this may need to be calibrated for your individual printer
probe_count: 5,5 #this is the number of probing points on X then Y axis
mesh_pps: 2,2
fade_start: 1
fade_end: 10
fade_target: 0

[safe_z_home]
home_xy_position: 115.00, 115.00 # Change coordinates to the center of your print bed
speed: 50
z_hop: 5 # Move up 10mm
z_hop_speed: 5

```

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<div class="post-metadata">

**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [February 15, 2025, 8:09pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/7 "2025-02-15T20:09:53Z")

</div>

**PLEASE!**  
Upload code as a file or at least use the `Preformatted Text` feature of the forum editor to put it into the right form. Things can be messed up without.

![Format](https://global.discourse-cdn.com/free1/uploads/klipper/original/3X/d/2/d2f569306c1aacc25f5c36d74a848c8f9093989f.png)

---

<div class="post-metadata">

**Author:** ![bsavage710](https://avatars.discourse-cdn.com/v4/letter/b/edb3f5/32.png) [@bsavage710](https://klipper.discourse.group/u/bsavage710)\
**Post date:** [February 15, 2025, 8:16pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/8 "2025-02-15T20:16:15Z")

</div>

```auto
Move out of range: 240.000 30.000 1.700 [0.000]
12:14 PM
probe at 192.500,30.000 is z=1.540000
12:14 PM
probe at 192.500,30.000 is z=1.540000
12:14 PM
Probe samples exceed tolerance. Retrying...
12:14 PM
probe at 192.500,30.000 is z=1.557500
12:14 PM
probe at 192.500,30.000 is z=1.535000
12:14 PM
probe at 145.000,30.000 is z=1.540000
12:14 PM
probe at 145.000,30.000 is z=1.532500
12:14 PM
probe at 97.500,30.000 is z=1.617500
12:13 PM
probe at 97.500,30.000 is z=1.605000
12:13 PM
probe at 50.000,30.000 is z=1.642500
12:13 PM
probe at 50.000,30.000 is z=1.660000
12:13 PM
BED_MESH_CALIBRATE PROFILE="default"
type or paste code here

```

---

<div class="post-metadata">

**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\
**Post date:** [February 15, 2025, 8:50pm UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/9 "2025-02-15T20:50:40Z")

</div>

```auto
[stepper_x]
step_pin: PB13
dir_pin: !PB12
enable_pin: !PB14
microsteps: 16
rotation_distance: 40
endstop_pin: ^PC0
position_endstop: 0
position_max: 230
homing_speed: 50

```

In line 9 the size is smaller than you tried to probe.

```auto
Move out of range: 240.000 30.000 1.700 [0.000]

```

Please open a new thread for this issue is different to that one that is already solved. Please attach all requested information.

---

<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:** [March 18, 2025, 6:51am UTC](https://klipper.discourse.group/t/ender-3-pro-btt-skr-mini-v3-no-mcu/21994/10 "2025-03-18T06:51:17Z")

</div>

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