Got EOF when reading from device

Got EOF when reading from device


This is actually an error raised by Linux operating system (OS) of the host and only reported by Klipper. It indicated that the contact to an attached hardware (mostly the MCU in this case) is lost. This can happen when the USB port is reset or the OS thinks the hardware has been disconnected.
This error often appears in conjunction with the Timeout with MCU / Lost communication with MCU errors


  • Unreliable connection between the printer-board and the MCU
  • Inadequate / over-loaded power supply of either the host or the main power supply
  • Loose connectors / crimping connections or damaged cables
  • Incorrectly powering the printer board over USB instead of the main power supply or supplying power simultaneously via USB and main power supply
  • Issues with the USB port on the Host SBC

Potential solutions

  • Check the hardware / cables / connectors
  • Make sure to use a properly dimensioned, good quality power supply unit for both the host and as main power supply
  • When printing very hot (extruder and or bed) the required current can overload the power supply. Reduce the temperature, if then the error is gone, the used power supply is too weak
  • Make sure a proper USB cable is used
  • Make sure the USB connector (especially on the printer-board side) is properly having contact
  • Change the used USB port, e.g. try USB2 vs. USB3 etc