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solve the problem of reprint OBJECTS due to a power outage


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Posted · solve the problem of reprint OBJECTS due to a power outage


I don't know if you had this type of problem, but I hate to repeat to print an object only because I had a electric blackout. To solve this problem you can save in the Rom the number of line of model Gcode and decrement it in the printing phase. In order to tell to the system that the object is not printed yet, for blackout or for power cord accidental removing, I think you can implement a one bit variable, a flag, checked by the system in the startup operations. If the flag is one the system read the actual Gcode line number and continue to print from it else, if the flag is zero, the system display the main menu as usual.


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Posted · solve the problem of reprint OBJECTS due to a power outage

Except that the problem would be much more complex then that. As you would lose the whole machine state. After rebooting the machine you no longer know where the head is, what temperature you need to be, and you lost the 16 moves in the movement planner, as well as the exact position in the current movement.

And you would wear out the EEPROM pretty quickly.


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    • 1 year later...
    Posted · solve the problem of reprint OBJECTS due to a power outage


    I am disappointed to have just found that in fact EEPROM does have a limited life.


    Do you have any ideas what that maximum number of prints is before things start to fail - also the maximum number of layers?  If the EEPROM can just outlast some other weakest link then it should be less of a concern.

    It seems that all you would need to store is the file and the Z height to minimize writing too much to EEPROM while being able to resume the print satisfactorily.  The algorithm would be similar to that of OP.  One could optionally only setup resume on prints with print times over X or start recording resume details after some Z height.  By reducing to a Z level granularity, you would significantly reduce the EEPROM stress and at most be off by LAYER_HEIGHT for part of a layer.

    Completion Flag (or this could be encoded into the Z value if space is tight).

    Z Value for layer height.

    File name

    Pseudocode Upon machine on:

    shouldResume() {


       if (!AUTORESUME) {


           while(nothingPressed) {}

           return RESUME; // RESUME is true or false based on the menu selection


       return True;


    resumePrint() {








    if (!lastPrintCompleted()  && printer.getBedTemp() > SALVAGABLE_RESUME_BED_TEMP) {

     if (shouldResume()) {


     } else {




    User Options

    It should be something that in the menus can be optionally turned on/off (print tracking that is).

    It should be optionally to automatically resume as default.

    Where to contribute?

    https://github.com/Ultimaker/Ultimaker2Marlin - is this the main firmware repo and if not where is it?  I wouldn't mind taking a crack on a fork/branch.

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