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  1. #1
    Regular 3D Printer
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    chain reaction of problems started

    Hi,
    I was lucky so far with my RL printer because until now i did not had any big issues.But now... i am facing some problems and maybe some forum members can give me any advice to solve the problem. Here the summary of what happend:

    1. because of filament jam inside the thermal barrier tube i needed to dismount the extruder/hotend to evaluate how i can get out this small piece of filament (it really stuck strong)
    2.while dismounting the heatblock the tiny thermistor (cable) came out -i really tried to avoid this situation!
    3.after investigation of the thermal tube i decided to re-assembling everything and try to heat up the hotend trough the manual operation mode
    in Repetier and then push some small metall pin (smaller than 2mm diameter) trough the tube.
    4. after assembling everything back together (except the thermistor wire which i just pushed back into the hole temporary.

    But now after connecting with the Printer i cannot heat-up/control the Extruder and the temperature of the headbed anymore.
    screenshot_ManualControl.jpg
    Connection with Printer seems OK
    Referencing in XYZ OK
    Extruder temperature shows fantasy value of 357.5 C (before try to heat up)
    Headbed temperature shows 28 C (before try to heat up)
    When i try to heat up the bed - it stays at 28C
    When i try to heat up the extruder -it stays at 357.5
    i cannot move any axis by single steps as well amymore
    WHAT IS GOING WRONG HERE?
    thanks in advance for any advice

  2. #2
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    Hi,

    I have questions about the thermistor, normally a thermistor look like that :
    thermistor.jpg
    You said that the cable came out, the wire only or with the head ?
    If it was only the wire, you broke it and you need to change it.
    (It is for this you have strange info about the temp)

    For the thermal tube, I had the same problem.
    Inside the thermal tube, you have a ptfe tube (silicone tube), so the best is to remove it and change it.
    It is a 3mm OD 2mm ID ptfe tube
    Last edited by SAO; 06-07-2015 at 12:44 PM.

  3. #3
    Regular 3D Printer
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    SAO, thanks for the info`s. The thermistor came out with the head (which is covered in glass). The wire itself looks ok.
    If the whole hotend thermistor is dead then i`m just wondering why i have now issues to control the headbed temperature as well?

    regading replace the ptfe tube:
    How did you removed this ptfe tube only from the main tube? press out?

  4. #4
    Expert 3D Printer
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    I don't explain the bed temp issue (perhaps the problem with your extruder thermistor and the strange temp it show don't allow you to change any temp)

    Thermistor are very fragile, perhaps yours is dead.
    Try to unplug the extruder thermistor on the board (in the photo ET).
    Not sure it will works because in the firmware there is 1 set

    RapidLogicBoard2.png
    And try to heat the bed.
    Don't try to heat the extruder without the thermistor !!!!!!
    Tell me if it works
    Last edited by SAO; 06-07-2015 at 12:34 PM.

  5. #5
    Expert 3D Printer
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    For the thermal tube :

    the side near the block heater :
    barrier tub.jpg

    You can see the ptfe tube.

    You insert a small allen key or anything small on the opposite side, and the pfte will go out
    you can even try to catch it with a small pliers .
    Last edited by SAO; 06-07-2015 at 01:21 PM.

  6. #6
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    I disconnected the extruder thermistor at board side and tested if i can at least heat up the bed - temp does not change.

    Regading remove the ptfe tube: some unmelted filament still stuck inside this tube and probably i cannot move the ptfa tube itself out

  7. #7
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    The ptfe tub in the thermal tube is in silicone, which can be heated to 250° without melted.
    Normally it is a slippery material, but I have forced to remove mine because there was an important jam.
    So even if there is something jammed which is melted or not inside you could be able to remove it.

    By pushing it or pulling it.

    You can even heat a little the thermal tube with a lighter but be careful to don't melt the silicone, and push the jam with the ptfe tub.
    Last edited by SAO; 06-07-2015 at 09:30 PM.

  8. #8
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    I was able to remove the jam by simply drilling with an 2mm drill trough the tube and the ptfe tube remained in place and seems undamaged which is nice- one problem solved.

    Regarding the Extruder thermistor i ordered an new one today and hopefully i`m not too rusty in soldering.. haha long time ago since i`ve done that
    to be continued...

    thx SAO for the help

  9. #9
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    I am just a beginner in soldering and it was easy.

    I cut the wires just after the old thermistor and I have soldered the new.
    I have put ptfe tub 0.3 mm ID 0.6 OD to insulate the thermistor wires.

    Remember if the thermistor is not the same as the original, to change the setup in the firmware

  10. #10
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    Good News-my printer works again after exchange the extruder thermistor!
    all functions checked and i`m printing now

 

 

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