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Voron V2 - SKR 2 (TMC2100, TMC2130, TMC5160, TMC5161, TMC5160HV, TMC5160_PRO) Wiring

Initial Removal of Jumpers

We have no idea what state your board is in when you start this process. Someone could have moved jumpers around already. But since we are here, on the SPI end of the site, then I assume that you might want to look at the next section before removing all the jumpers because if all the jumpers are already set for SPI mode then removing them and placing them right back in would be a waste of your valuable time.

If one does not understand what I mean by “if the jumpers are set for SPI” then I would recommend that removing all the jumpers would be the place to start.

Remove all YELLOW on-board jumpers, located at the positions shown below:

Initial Preparation for SPI Mode - Set Jumpers

  • Set the on-board jumpers, located at the positions as shown by the GREEN jumpers in the diagram below:
  • If you want to open the above picture, in a new tab of your web browser, then click here

Voltage Selection Headers and Other Headers

  • Set the USB-PWR jumper to the VDD position (as shown in the ORANGE box) to avoid the interaction between the USB 5V of Raspberry Pi and the DC-DC 5V of the motherboard.

  • Ensure all of “DIAG Jumpers” (shown in the PURPLE box) are removed, since the Voron printer does not use sensorless homing.

  • In the diagram below, ensure that the “WIFI/UDISK Select” Jumpers (as shown in the YELLOW box) are set for WIFI to ensure the UDISK port is not connected (both jumpers have an empty pin beneath them).

IMPORTANT: Double check all the GREEN jumpers are set appropriately, especially the jumpers called out by the COLORED BOXES, BEFORE the power supply is connected.

  • If you want to open the above picture, in a new tab of your web browser, then click here

Stepper Motor Drivers

    • Inspect the stepper motor drivers for left over rosin, and clean with IPA, if needed
    • Before installing heat sinks on to the stepper motor drivers, please read this
    • Install heat sinks on all stepper motor drivers

MCU X/Y/E, Hot End in SPI Mode

    • Connect 24V and GND (V+ and V-) from the PSU to Power In
    • Connect stepper driver for the B Motor (gantry left) into position X-M (driver socket)
    • Plug in stepper motor for the B Motor (gantry left) into position XM (motor connector)
    • Connect stepper driver for the A Motor (gantry right) into position Y-M (driver socket)
    • Plug in stepper motor for the A Motor (gantry right) into position YM (motor connector)
    • Connect stepper driver for the extruder motor into position E0-M (driver socket)
    • Plug in stepper motor for the extruder motor into position E0M (motor connector)
    • Connect the hot end heater to HE0 (PB3)
    • Connect the part cooling fan to FAN1 (PB6)
    • Connect the hot end fan to FAN0 (PB7)
    • Connect the controller fan A to FAN2 (PB5)
    • Connect the hot end thermistor to TH0 (PA2)
    • Connect the X endstop to X-STOP (PC1)
    • Connect the Y endstop to Y-STOP (PC3)
    • Connect USB Cable to your SKR 2,  but do not connect it yet to your Raspberry Pi

MCU X/Y/E, Hot End in SPI Mode Wiring Diagram

  • If you want to open the above diagram, in a new tab of your web browser, and have the ability to zoom and download the diagram in JPG format then click here

MCU Z, Bed, Exhaust Fan in SPI Mode

    • Connect 24V and GND (V+ and V-) from the PSU to Power In
    • Connect stepper driver for the Z into positions X-M (driver socket)
    • Plug in stepper motor for the Z into positions XM (motor connector)
    • Connect stepper driver for the Z1 into positions Y-M (driver socket)
    • Plug in stepper motor for the Z1 into positions YM (motor connector)
    • Connect stepper driver for the Z2 into positions Z-M (driver socket)
    • Plug in stepper motor for the Z2 into positions ZMA (motor connector)
    • Connect stepper driver for the Z3 into positions E0-M (driver socket)
    • Plug in stepper motor for the Z3 into positions E0M (motor connector)
    • Connect the bed SSR (DC Control Side) to HBED (PD7)
    • Connect the controller fan B to FAN2 (PB5)
    • Connect the chamber exhaust fan to FAN1 (PB6)
    • Connect the heated bed thermistor to TB (PA1)
    • Connect the Z endstop to Z-STOP (PC0)
    • Connect the Probe Signal (with BAT85 diode) to PROBE connector (PE4)
    • Connect the Probe PWR and GND to FAN3
    • Connect USB Cable to your SKR 2,  but do not connect it yet to your Raspberry Pi
BAT85
a Schottky barrier diode. BAT85 is needed to protect the SKR board (MCU board) from being fried. An inductive probe device (Omron TL-Q5MC2; Omron TL-Q5MC2-Z or Panasonic GX-HL15BI-P) communicates at a much higher voltage level (10V - 30V) then the MCU board. The BAT85 is used to protect the input signal PIN of the MCU board; without the BAT85 the MCU board will be damaged. If two BAT85s are used in series, the circuit will protect the MCU board and still allow the inductive probe to function properly. For more information, click here

MCU Z, Bed, Exhaust Fan in SPI Mode Wiring Diagram

  • If you want to open the above diagram, in a new tab of your web browser, and have the ability to zoom and download the diagram in JPG format then click here

Please Ensure the Heat Sinks are Installed Before Use

Note on the Orientation of the Stepper Motor Driver’s Heat Sinks
Place the heat sinks for the stepper motor drivers so that the orientation of the fins on the heat sinks are parallel to the air flow from the controller fans once the MCU board is installed on the DIN rail. Ensure the heat sinks are not touching the solder joints located on the top of the step stick. Please note, that your placement of heat sinks may be different from the orientation shown below.

MCU X/Y/E, Hot End with Heat Sinks Installed

MCU Z, Bed, Exhaust Fan with Heat Sinks Installed

Raspberry Pi

Power

  • The BTT SKR 2 board is NOT capable of providing 5V power to run your Raspberry Pi.

Setting up UART Serial Communications with the Raspberry Pi

SSR Wiring (Boards Shown is in SPI mode)

  • Wire colors will vary depending on your locale.
  • If you want to open the above diagram, in a new tab of your web browser, and have the ability to zoom and download the diagram in PNG format then click here

The Klipper Configuration file by TechnoPhreak for SKR 2 board (UART mode - SPI mode needs to be added to this)

The Klipper Configuration file from VoronDesign/VoronUsers TechnoPhreak’s GitHub Repo for SKR 2 board is located here;

After I have Wired up the MCU Board, What Comes Next?

  1. Once the MCU board is wired up and wire management has been performed, the next step is to install Mainsail/Fluidd or Octoprint, please see The Build ═► Software Installation

  2. Once Mainsail/Fluidd or Octoprint has been installed, the next step is to compile and install the Klipper Firmware, please use the Color Pin Diagram displayed here, look for “Klipper Building Options”; an alternative source of information on “how to build and install the Klipper firmware for the SKR 2” is at TechnoPhreak’s README file

  3. Once the MCU board has the Klipper Firmware Installed, the next step is to create/edit the Klipper Config file (TechnoPhreak’s printer.cfg file is already named printer.cfg, but you will need to replace UART with SPI). Please see the file located here as a good starting point;

  4. After creating/editing the Klipper Config file (printer.cfg), the next step is to check all the Motors and the mechanics of the Voron printer, please see The Build ═► Initial Startup Checks