Power fails restore feature

Please add power fail restore (restore print where left if accidentally main power is gone) feature. Prusa i3 MK3 new printer has this feature and it is great feature.

Comments

  • How do they solve detecting that there is no power and how do they store current position? Without power the processor is not running any more. The solution I know is a hardware addition detecting this and giving power for a short time to save position, but without this I don't see how to do this.
  • Maybe there is a way if we store every new GCODE line in a file on SD card when it sends to 3D printer... So every time new GCODE command will be sent it will be saved in SD card and at the end of print that file will be removed from SD card. Now if power fails, on machine restart firmware will read SD card for backup file, if it finds file it means there was power failed and it will start printing from that last command... 
    Or on the other hand gcode file will be updated each time command is sent to printer and that command will be deleted from GCODE file. So when restore print will be started from GCODE, it will be the last position of file...
  • Don't think that will work. That means you print with host/server and then they need to know where it stopped. Maybe if they would do it and the filesystem is not corrupt from power out of computer they can restore. It is not easy especially since we can normally not home but do not know xyz position at restart of printer.
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