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My Anet A8 Plus worked normally, but after the weekend and changing for new bearings on the rods, it is not working anymore at all.

I experience random reboots, the nozzle can only heat to about 10 °C away from the target and then starts to drop, the printer gives the halted error.

Example: Target is 240 °C, the nozzle temperature goes to like 232 °C and then starts to drop pretty fast. The Bed heats good otherwise.

troubleshooting so far

The PSU gives 24 V and the supply voltage switch is 220 V like it should. No matter if I try print it through OctoPrint or Cura, the same thing happens.

How it can break this bad just from replacing a few bearings is not clear to me. Do these reboots mean the PSU is dead and not giving constant voltage? Reboots come even idle or just bed heating etc.

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Reboots happen in 2 cases on a printer:

  • If the board power has been below a the operational threshold (~3 V) and the capacitors on the board are empty, the power dip can result in a reboot.
  • If a device connects to the serial-USB port, it reboots.

If you power up the printer not connected to any other device, it should run continuously. If it flickers and reboots, the power-lines to the board or the PSU are bad. Check those in reverse.

If it only reboots again and again when connected to a serial port (PC, Octoprint etc), your problem is the cable - it might be jiggling or be defective, or otherwise de- and re-connect again and again.

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