You are currently viewing How to install Klipper on the SKR Mini E3 V3

How to install Klipper on the SKR Mini E3 V3

Why Klipper on the SKR Mini E3?

The SKR Mini E3 V3 provides several benefits over the stock mainboards to run Klipper:

  • very good heat dissipation thanks to the upgraded heat sink and a better separation of the drivers
  • silent TMC2209 drivers and 3 PWM Controlled fans
  • UART controlled TMC drivers which allows the firmware to control the stepper motor mode & current and to monitor the drivers
  • Support for expansion: Touch screen, filament runout detection, BLTouch + dual Z-axis (running of a single driver)
  • Run the stepper motors in spreadCycle mode instead of stealthChop mode (faster & more accurate positioning, no skipped steps)
  • Klipper pressure advance => Much better retraction quality (Marlin linear advance is incompatible with TMC drivers standalone mode)
  • + everything that makes Klipper so great: input shaping, web interface, configuration changes with no recompilation etc.

What You Need

BIGTREETECH SKR Mini E3 V3.0
Raspberry Pi 4 Model B
64GB Micro SD Card
Short USB A to Micro USB B Cable (30 cm or 1 foot)
Waveshare 4inch HDMI LCD
Optional: If you want a small LCD touch screen to control your printer with KlipperScreen
This touch screen from Waveshare is nice because it can be plugged directly on top of the Raspberry Pi 4 and doesn’t need a separate power supply. See here for more information
ADXL345 Triple-Axis Accelerometer
Optional: If you want to tune input shaping
Raspberry Pi camera
Optional: If you want to monitor your 3d printer remotely
Raspberry Pi camera extension cable 1 meter
Optional: If you want to connect a Raspberry Pi camera to the Pi
LM2596S DC-DC Buck Regulator Power Module
Optional: If you want to power the Raspberry Pi (5V) directly from the printer power supply (12V or 24V)
Dupont Ratchet Crimping Tool Set
DISCLAIMER: Some links are affiliate links. As an Amazon Associate I receive a small commission (at no extra cost to you) if you make a purchase after clicking one of the affiliate links. Thank you for supporting the channel!

SKR Mini E3 V3 Installation & Wiring

The SKR Mini E3 V3.0 is almost a direct replacement of the Ender 3 mainboards. It has the same physical size & mounting holes. The only differences are:

  • The polarity +/- of some connectors (e.g. HEAT BED, HOTEND) is reversed
  • The HOTEND HEAT SINK FAN requires a JST 2 pins connector (in the Creality mainboards, it is connected directly, without a connector)
BigTreeTech SKR Mini E3 Mainboard Wiring
Creality V4.2.7 Mainboard Wiring
Creality V1 Mainboard Wiring

Hardware installation for Klipper

To install & connect everything for Klipper, please refer to the video below (e.g. Ender 3 Pro). You need a Raspberry Pi 3 or 4, connected to the SKR Mini E3 with an USB cable. Optionally, you can power the Raspberry Pi directly from the power supply of the 3D printer by using a Y-splitter cable and an LM2596S DC DC regulator to lower the voltage from 12V/24V to 5V. You also might want to use some 3d printed parts to make a clean install: See section “3D printed parts to install Klipper on your Ender 3” on this page. Finally, you might want to install an LCD touch screen to control your 3d printer with KlipperScreen.

Configure the Raspberry Pi to run Klipper

You need to setup the Raspberry Pi to run Klipper. Again, please refer to the video above. The easiest way to get started with Klipper is to use a Raspberry Pi image like MainsailOS or FluiddPI. Download FluiddPI from GitHub.

Write the image to an SD card, using Raspberry Pi imager. Before clicking on WRITE, press CTRL+SHIFT+X to configure advanced options.

Insert the SD Card into your Raspberry Pi and turn it on.

Connect to the Raspberry Pi web interface using the hostname you set when you wrote the image (e.g. http://ender3). This gives you access to the Fluidd web interface for Klipper. Don’t worry about the “Unable to open config file” error message: we will fix this shortly.

Install Klipper on the SKR Mini E3 V3

To use Klipper on your SKR Mini E3 V3, you will need to compile and flash the Klipper micro-controller code as per BigTreeTech instructions.

To compile the micro-controller code for the 3d printer mainboard, connect to the Raspberry Pi with ssh.

Open the Klipper Firmware Configuration tool.

pi@ender3:~ $ cd ~/klipper
pi@ender3:~ $ make menuconfig

Select STM32 for the Micro-controller architecture, STM32G0B1 for the processor model, a 8KiB bootloader, and the USB communication interface.

Klipper Firmware Configuration for the SKR Mini E3 V3.0

Now exit (type Q), save the configuration (type Y) and compile the firmware by typing:

pi@ender3:~ $ make

This creates a klipper.bin file in the klipper/out directory. You can now copy this file to an SD Card by running SCP on a Windows or Linux computer running on the same network as the Raspberry Pi. Rename the file to “firmware.bin” (e.g. H: is the SD Card drive). The SKR Mini E3 only allows the flashing of a file named “firmware.bin”.

scp pi@ender3:~/klipper/out/klipper.bin H:\firmware.bin

Insert the SD card into the SKR Mini E3 and turn it on to flash the firmware. Now connect the Raspberry PI to the printer using a Micro USB B to USB cable.

You can confirm that the flash was successful, by running ls /dev/serial/by-id. if the flash was successful, this should now show a Klipper device, similar to:

pi@ender3:~ $ ls /dev/serial/by-id
usb-Klipper_stm32g0b1xx_27000D000150414235363020-if00

Save this information for later as it will be needed when updating printer.cfg

Configure Klipper for the SKR Mini E3

You can download my Klipper configuration files for the SKR Mini E3 V3.0 on GitHub.

This should give you a good starting point to make your config (it’s often easier to modify something than to start from scratch!)

The first thing to do is to update the [mcu] section of printer.cfg with the serial port name. You can get the serial port name by running ls /dev/serial/by-id on the Raspberry Pi.

[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32g0b1xx_27000D000150414235363020-if00
# restart_method: command

To get the fans working properly in Klipper, connect the fans as per the Wiring section above and update printer.cfg as shown below:

  • The Part Cooling Fan (FAN0/PC6) is controlled by the slicer / gcode commands. Adda [fan] section to printer.cfg:
[fan]
pin: PC6
  • Configure the Hotend Heat Sink Fan (FAN2/PB15) to turn on at full speed when the hotend is above 50 deg C. Add a [heater_fan] section in printer.cfg:
[heater_fan hotend_fan]
pin: PB15
heater: extruder
heater_temp: 50.0
  • Configure the Electronic Enclosure Fan (FAN1/PC7) to turn on automatically whenever any driver is enabled and to turn off (or reduce to idle speed) 60 seconds after drivers are turned off. Add a [controller_fan] section in printer.cfg:
[controller_fan electronic_enclosure_fan]
pin: PC7
idle_timeout: 60

If you want to keep using your stock ST7920 LCD (Ender 3 Pro/CR10) with the SKR MINI E3 V3.0, add a [display] section in your printer.cfg configuration file:

[display]
lcd_type: st7920
cs_pin: PB8
sclk_pin: PB9
sid_pin: PD6
encoder_pins: ^PA10, ^PA9
click_pin: ^!PA15

[output_pin beeper]
pin: PB5

To add a BLTouch to the SKR Mini E3 V3, add a [bltouch] section to printer.cfg:

[bltouch]
sensor_pin: ^PC14
control_pin: PA1
x_offset: -36
y_offset: 0
z_offset: 2.00

You will need to update x_offset, y_offset, and z_offset to match the offsets of your current setup. You can also define a [safe_z_home] section to home toward the center of the print area:

[safe_z_home]
home_xy_position: 151,115   # Nozzle coordinates
speed: 250
z_hop: 10
z_hop_speed: 5

To use the probe in place of the z endstop, set the stepper_z endstop_pin to “probe:z_virtual_endstop”:

[stepper_z]
step_pin: PB5
dir_pin: !PB6
enable_pin: !PC3
microsteps: 16
rotation_distance: 8
endstop_pin: probe:z_virtual_endstop
#position_endstop: 0.0
position_min: -4
position_max: 250

The stepper motor and their current can be configured in printer.cfg. For my setup (BondTech BMG/E3D V6), I have:

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

[tmc2209 stepper_x]
uart_pin: PC11
tx_pin: PC10
uart_address: 0
run_current: 0.580
hold_current: 0.500
stealthchop_threshold: 999999

[stepper_y]
step_pin: PB10
dir_pin: !PB2
enable_pin: !PB11
microsteps: 16
rotation_distance: 40
endstop_pin: ^PC1
position_endstop: -12
position_min: -12
position_max: 230
homing_speed: 50

[tmc2209 stepper_y]
uart_pin: PC11
tx_pin: PC10
uart_address: 2
run_current: 0.580
hold_current: 0.500
stealthchop_threshold: 999999

[stepper_z]
step_pin: PB0
dir_pin: PC5
enable_pin: !PB1
microsteps: 16
rotation_distance: 8
# endstop_pin: ^PC2
# position_endstop: 0.0
endstop_pin: probe:z_virtual_endstop
position_min: -4
position_max: 250

[tmc2209 stepper_z]
uart_pin: PC11
tx_pin: PC10
uart_address: 1
run_current: 0.580
hold_current: 0.500
stealthchop_threshold: 999999

[extruder]
step_pin: PB3
dir_pin: !PB4
enable_pin: !PD1
microsteps: 16
rotation_distance: 7.71
nozzle_diameter: 0.400
filament_diameter: 1.750
max_extrude_only_distance: 100
pressure_advance: 0.04
pressure_advance_smooth_time: 0.040

heater_pin: PC8
sensor_type: ATC Semitec 104GT-2
sensor_pin: PA0
control: pid
pid_Kp: 21.527
pid_Ki: 1.063
pid_Kd: 108.982
min_temp: 0
max_temp: 300

[tmc2209 extruder]
uart_pin: PC11
tx_pin: PC10
uart_address: 3
run_current: 0.580
hold_current: 0.500
stealthchop_threshold: 999999