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

Adding a Second Extruder

Discussion in 'General Questions' started by Myah Garcia, May 13, 2020.

  1. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    Hi. I have a Robo R2, and I have started the process of adding a second extruder.

    After a few bumps in the road, I finally bought a new extruder and got my Robo R2 to list the second one. I plugged it in and noticed an issue. The second extruder read as 0.0*C.

    Is there any way I can fix this? I obviously can’t 3D print with this extruder without the printer reading the temperature. Please help!
     
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    Myah Garcia likes this.
  3. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    Thank you! I’ll check it out!
     
  4. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    So I looked at my control board this morning. In another thread, I saw something about E0 and E1 both needing to be plugged in. On my R2, neither of those are plugged in.

    Besides that, everything seems to be plugged in. I open up the extruder assembly because one of the screws is stripped, but all of the wires are where they should be on the outside.
     

    Attached Files:

  5. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    Here are pictures of the extruder wires.
     

    Attached Files:

  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    I suspect the thermistor is NOT run back to the control board. On mine I had to add the wiring for that if I recall correctly.
    I certainly had to add all of the wiring internal to the extruder I assumed that would already be in place for the R2.
     
  7. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    Do you think it could be a problem with one of the boards (Uptown, Downtown, Main, etc)? I checked all of the wires from the uptown board to the downtown board, and they all seem to be working. I just don’t know which board it would be.
     
  8. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    Well, it could be anywhere in that chain. I doubt it is the boards themselves.
    Probably the easiest (heh...) way to test this is to read resistance to the thermistor from the connectors starting with the uptown board.
    Read the resistance towards the thermistor from the uptown board connections. It you do not get 100k (or close to 100k ohms) then you have a bad wire to the downtown board or the thermistor itself. If you do get the approximate 100k ohm reading then the wiring from the uptown board to the controller is the problem.
     
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    P.S. obviously this would be done with the power removed completely ...
     
  10. Myah Garcia

    Myah Garcia New Member

    Joined:
    May 13, 2020
    Messages:
    6
    Likes Received:
    0
    I have never done this before... Where and how do I read the resistance?
     
  11. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    I would have to go over my disassembly photos again.
    The thermistor plugs into the downtown board and then is wired to the uptown board (connectors at both ends and there is a small board buried in the middle with connectors as well). Then it runs back to the controller (connector there too). About the best you could do would be to start at one end and work your way towards the other checking for resistance of the thermistor at each connector. Or at least verify the wires are installed. My C2 did not have the second extruder wiring run from the controller to the uptown board and none for the second extruder from the uptown to the downtown board either. I can't speak for the R2, but I noted in my thread that I assumed the R2 would have that wiring installed... I just do not know that. Perhaps @Geof or @tkoco or @WheresWaldo (one of the R2 folks) can confirm if the wiring is even there. The connectors were, but no wiring harness wires were on mine.
     
  12. Geof

    Geof Volunteer Moderator
    Staff Member

    Joined:
    Nov 9, 2015
    Messages:
    6,698
    Likes Received:
    2,308
    No wiring on mine but it was a very early model connections appeared there fwiw
     
  13. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    That would be my suspicion... that some or all of the units did not come internally wired for the 2nd hotend. Otherwise the C2 units would have had them... there is no real difference in the two extruder heads/mounts that I can see. Manufacturing two different sets would have been not really cost-effective. What make identical parts that vary only by a few wires?
     
  14. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    22,232
    Likes Received:
    7,143
    If that is true you can use the thread I did for the C2 to see where the wiring needs to be added into the extruder/print head with relation to the uptown and downtown boards.
     

Share This Page