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printer.cfg Changes & Klipper updates

You just updated klipper, and now your printer won’t start? Don’t worry. The vast majority of these issues are quickly fixed with a few easy changes to your printer.cfg

Do note: this guide is only intended to highlight changes that show up in at least one stock Voron configuration. If you have a heavily customized config, you will likely also need to have a look at the Klipper config changes document

Change Date Printer changes required
2021-03-04 All Moonraker now requires [octoprint_compat] in moonraker.conf, in order to accept octoprint style slicer uploads
2020-12-22 All Klipper is depreciating step_distance: in favour of rotation_distance: Please see the rotation_distance document. Although it’s currently in a soft transition period, this change will eventually break all existing printer.cfg
2020-11-20 Voron-2 If you are using aliases, aka, a [board_pins] section: add the line mcu: mcu, z
2020-10-29 All If you are using a Fystec Mini12864, or other display with neopixels: in the [neopixel] section, replace color_order_GRB: False with color_order: RGB
2020-09-02 All If you are using a MAX31865 amplifier, there was a math error, which has now been corrected. you will need to re calibrate all printing temperatures, and re PID-tune your extruder.
2020-08-09 All If you are using any custom display menus, the configuration has changed. You will need to remove these menus, or re-write them with the new formatting

Okay, my printer.cfg is good, but now I’m getting this other error:

Recv: // Unknown command: queue_digital_out
Recv: // This type of error is frequently caused by running an older
Recv: // version of the firmware on the micro-controller (fix by
Recv: // recompiling and flashing the firmware).

Remember, klipper is split into two halves. the main software, which runs on your Pi, and the MCU firmware, which runs on the SKR or other printer control board. These sorts of errors typically mean that you have updated the main software, but not the MCU Firmware. You should follow the flashing process for your specific MCU board, found in the build docs