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How to Prevent writing to SD card ?

Discussion in 'General Questions' started by tonycstech, May 15, 2019.

  1. tonycstech

    tonycstech Active Member

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    My printer is flyingbear ghost. LCD controller writes current print state to SD card to allow resuming if power fails.
    It is constantly writing data to SD card to record print progress.
    Problem is that its not doing it very well. If power fails, gco file gets corrupted and if you attempt to print it again, it will most likely drive hot end where it does not belong creating problems and even breaking the machine.

    Any help with that ?
    SD card write protection switch is not helping. Controller is cheap and does not check that by design.
    Firmware hack maybe ?
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Not really familiar with that printer. Have you tried this group?

    https://www.thingiverse.com/groups/flyingbear

    Yes, it sounds like a firmware hack would be the only approach. A cheap UPS power supply would be an alternative :)
     
  3. tonycstech

    tonycstech Active Member

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    What do you mean "cheap UPS" ? How would adding another power supply help the problem ?
     
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I mean a cheap uninterruptible power supply for the printer to keep it from losing power.

    I run all of mine on one, they will hold for 40-90 minutes.
     
  5. tonycstech

    tonycstech Active Member

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    I dont need that. Problem is not the power, but the constant data writing.
    In fact, thats how i turn the printer off, i just use M81 command to trigger 5v relay which causes AC line to break and disconnecting printer from power completely.
    M81 code is executed at the end of each print but i do allot of manual power off's by pressing RESET switch. It does same thing.
     
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    #6 mark tomlinson, May 15, 2019
    Last edited: May 15, 2019

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