1. Got a question or need help troubleshooting? Post to the troubleshooting forum or Search the forums!

How to Prevent writing to SD card ?

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

  1. tonycstech

    tonycstech Active Member

    Joined:
    Dec 16, 2013
    Messages:
    606
    Likes Received:
    196
    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 ?
     
    #1 tonycstech, May 15, 2019
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,912
    Likes Received:
    7,338
    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 :)
     
    #2 mark tomlinson, May 15, 2019
  3. tonycstech

    tonycstech Active Member

    Joined:
    Dec 16, 2013
    Messages:
    606
    Likes Received:
    196
    What do you mean "cheap UPS" ? How would adding another power supply help the problem ?
     
    #3 tonycstech, May 15, 2019
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,912
    Likes Received:
    7,338
    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.
     
    #4 mark tomlinson, May 15, 2019
  5. tonycstech

    tonycstech Active Member

    Joined:
    Dec 16, 2013
    Messages:
    606
    Likes Received:
    196
    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.
     
    #5 tonycstech, May 15, 2019
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,912
    Likes Received:
    7,338
    #6 mark tomlinson, May 15, 2019
    Last edited: May 15, 2019

Share This Page