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Mods and experiences with our Robo 3D R1+ (1st Printer)

Discussion in 'Mods and Upgrades' started by Curtis Wolfe, Feb 27, 2017.

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  1. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Maybe. The build plate flexes less at X0, Y0 than it does in the middle so it might make your Z Offset reflect just the amount of travel that it takes to actuate the switch rather then the same length + the amount the bed flexes.
     
    #301 WheresWaldo, Apr 19, 2017
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  2. Curtis Wolfe

    Curtis Wolfe Active Member

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    I previously thought my start up G-code was causing some print issues. turns out bed level was the issue, but I had grabbed somebodies start up G-code off the internet. So my start up is a little different.
     
    #302 Curtis Wolfe, Apr 19, 2017
  3. Curtis Wolfe

    Curtis Wolfe Active Member

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    I thought I should mention it will shut down like this when just pre-heating also.
     
    #303 Curtis Wolfe, Apr 19, 2017
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    If the thermistor is not working correctly it could happen at any point really. Vibration and movement just make it more likely.
     
    #304 mark tomlinson, Apr 19, 2017
  5. Curtis Wolfe

    Curtis Wolfe Active Member

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    So, I did the whole clean out the thermistor routine again. Not nearly as lucky this time. So I decided to test pre-heating the Hotend and bed one at a time. Hotend I can bring up to temp and it will hold. I went as high as 230 and let it hold for about 10 minutes. No problem. I heat up the bed. It hits about 50 and the system shuts down. Weird huh? If I heat up the hotend to temp and then try to heat up the bed. It shuts down.

    As both are warming up together or separately as the temps rise I can tell there's a power pull. The LED start flickering (I always thought they were just going bad) and I can hear the fans whirling inside. This usually indicates a shut down is about to take place, but so far it has only shut down with pre-heating the bed.

    I'm going to test this a few more times
     
    #305 Curtis Wolfe, Apr 19, 2017
    Last edited: Apr 19, 2017
  6. Curtis Wolfe

    Curtis Wolfe Active Member

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    Tested this three more times.

    I'm going to try and run a print with 0 bed temp.
     
    #306 Curtis Wolfe, Apr 19, 2017
    Last edited: Apr 19, 2017
  7. Curtis Wolfe

    Curtis Wolfe Active Member

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    Hmmmmm. It's printing. I've collected some data from these tests but I'm not sure how to interpret it.

    It sounds different.
     
    #307 Curtis Wolfe, Apr 19, 2017
  8. Curtis Wolfe

    Curtis Wolfe Active Member

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    Got three good prints out of the Robo lastnight. As long as I don't try to heat up the bed. The hotend temps held pretty good. It was having a hard time hitting my temp target of 205 and holding it. I turned my fans down to about 80% and it held it fine.

    Any thoughts?
     
    #308 Curtis Wolfe, Apr 20, 2017
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    what size heater core?
    How old is it?
     
    #309 mark tomlinson, Apr 20, 2017
  10. Curtis Wolfe

    Curtis Wolfe Active Member

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    I'm not sure Mark. How would I determine that?

    I bought this Robo as a refurbished unit about two months ago.
     
    #310 Curtis Wolfe, Apr 20, 2017
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    So if it is the stock hotend (Hexagon) then it is a 30w core.

    (If it has "aged" it may be less than that now, but lets assume it is fine)

    The "FANS" you are talking about I presume are the part cooling fans and they should NOT be pushing air across the hotend or nozzle, but rather directly onto what is printed. If they are blowing air across the nozzle then that will cause the heater to have to work a lot harder. When you add multiple fans or larger fans it is almost a certainty that some extra airflow around the nozzle is going to happen unless you have used ducted fans designed for that specific hotend.

    The solution is to avoid having the part cooling fan cool the hotend :)
    You can boost the heater core wattage (40w cores are cheap) and in that case a little extra cooling may not matter.
     
    #311 mark tomlinson, Apr 20, 2017
  12. Curtis Wolfe

    Curtis Wolfe Active Member

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    I have an extra parts cooling fan, but I did print out the fan ducts that point the airflow down to the print.

    More troublesome is the fact that my system shuts down if I try to heat my bed. I have my shut down pproblems isolated to that.
     
    #312 Curtis Wolfe, Apr 20, 2017
  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    We need to see the GCode terminal log from a shutdown event.
    .
     
    #313 mark tomlinson, Apr 20, 2017
  14. Curtis Wolfe

    Curtis Wolfe Active Member

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    Here you go
     

    Attached Files:

    #314 Curtis Wolfe, Apr 20, 2017
  15. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    Looks like the firmware rebooted.
    That suggests a power glitch or problem with the arduino.

    Something appears to have caused a reset to the Arduino.
     
    #315 mark tomlinson, Apr 20, 2017
  16. Curtis Wolfe

    Curtis Wolfe Active Member

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    Yup. It's having some type of power surge and this happens when I pre-heat my bed. or pre-heat my hotend and bed at the same time.

    I can pre-heat the hotend and get a printout of it with 0 temp on the bed.
     
    #316 Curtis Wolfe, Apr 20, 2017
  17. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    So either the power supply itself is failing or the RAMPS most likely.
    I suppose we can not conclusively rule out the arduino either.

    I am lazy and the parts are cheap so I would just do a bulk swap out :)
    [Arduino/RAMPS/Power supply]

    I recently had to do something similar on one and ended up going through not one, not two but three RAMPS cards <sigh> Thank goodness for Prime (and I returned the defective ones)

    The more logical approach would be in bits. The power supply has been an issue in the past, but probably would be the last one I would switch.
     
    #317 mark tomlinson, Apr 20, 2017
  18. Curtis Wolfe

    Curtis Wolfe Active Member

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    I have two extra RAMP boards and a power supply.

    I'll give Robo a call and see what they think since I've kind of isolated the problem
     
    #318 Curtis Wolfe, Apr 20, 2017
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  19. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    You might just sanity check the wiring to the heated bed. There could be a problem there causing a short when it is powered, but that is a slime chance.
     
    #319 mark tomlinson, Apr 20, 2017
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  20. Curtis Wolfe

    Curtis Wolfe Active Member

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    Somebody suggested it might be all the add ons I have. The extra parts cooling fans, the 80mm fan that's running directly off the power supply in the case, and the LCD screen. It's been running fine with those for a couple weeks so I wouldn't think so. I'll crack open the case tonight and see if I can see anything going on in there.
     
    #320 Curtis Wolfe, Apr 20, 2017
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