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

Inconsistent Filament Flow + Hobbed Bolt shards

Discussion in 'Troubleshooting' started by gr8se, May 10, 2014.

Thread Status:
Not open for further replies.
  1. gr8se

    gr8se New Member

    Joined:
    Jan 25, 2014
    Messages:
    31
    Likes Received:
    7
    I am looking for any help regarding filament flow/ dust and shards in the hobbed bolt.

    I have had many successful 1,2, and 3 micron prints, some over 20 hours long, but now I cannot even print the calibration cube. Please see my pictures and settings below. Hopefully I can get moving in the right direction again.

    I can freely push filament through so I'm pretty certain that I don't have a partial extruder head clog. The hobbed bolt has been altered to many different tightnesses, as well as the spring bolts, and I still get inconsistent extrusion. My spool is feeding from the top. No matter what I do temperature wise the extrusion always ends up poor.

    The pictures have the following settings:

    ROBO 3d PLA PLASTIC - printed on painters tape.
    *LAYER HEIGHT - .2046 mm
    *PERIM SPEED - 30 mm *NUMBER OF PERIM - 2
    *FILL - 1 rectilinear *FILL SPEED - 30 mm *SOLID LAYERS - 5 bottom
    *EXTRUDER TEMP FIRST - 188 *EXTRUDER TEMP ALL - 175 *EXTRUDER RETRACTION - 3
    *FAN - 100

    photo copy.JPG photo 4.JPG photo 5.JPG photo 3.JPG photo 2.JPG
    photo 1.JPG
     
    #1 gr8se, May 10, 2014
  2. gr8se

    gr8se New Member

    Joined:
    Jan 25, 2014
    Messages:
    31
    Likes Received:
    7
    do I just replace the hobbed bolt?
     
    #2 gr8se, May 10, 2014
  3. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,917
    Likes Received:
    7,338
    The factory supplied hobbed bolt I got was not a very good one. I constantly fought similar issues.
    I upgraded it (actually bought 3 different ones and tried them all) to one I am happy with. All were from eBay, all were about $5. There are several other threads on here with details on different ones you can review to pick which one you think you want to try. I have NOT had this issue since.

    Me? I would replaced it.
     
    #3 mark tomlinson, May 10, 2014
    3 people like this.
  4. gr8se

    gr8se New Member

    Joined:
    Jan 25, 2014
    Messages:
    31
    Likes Received:
    7
    Thanks a lot Mark, that's what I have to do. Any theories on why I was able to print very well for about 3 weeks before having this problem?
     
    #4 gr8se, May 10, 2014
  5. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,917
    Likes Received:
    7,338
    No, when it comes to the hobbed bolt I have only wild guesses. It took me over a month to get to the point where I was getting everything else correct enough to even look at the hobbed bolt :) But I had been cleaning shavings out all along.
     
    #5 mark tomlinson, May 10, 2014
  6. Galaxius

    Galaxius Well-Known Member

    Joined:
    Jan 18, 2014
    Messages:
    632
    Likes Received:
    342
    #6 Galaxius, May 10, 2014
    2 people like this.
  7. Denys Dmytriyenko

    Denys Dmytriyenko Active Member

    Joined:
    Nov 29, 2013
    Messages:
    119
    Likes Received:
    59
    I've read that thread and will probably end up ordering the hobb myself. Someone mentioned Robo3D reversed hobb orientation in November, and indeed, my hobb has the new reversed orientation with nut in the large gear, not the bolt's head. Looking closely the hobb grooves are upside-down, i.e. it gets better grip for retractions...

    Sent from my Nexus 7 using Tapatalk
     
    #7 Denys Dmytriyenko, May 10, 2014
  8. Galaxius

    Galaxius Well-Known Member

    Joined:
    Jan 18, 2014
    Messages:
    632
    Likes Received:
    342
    Mine's the same Denys. I ordered 2 new hobbed bolts, one with the hobb at 15mm (reversed orientation) and one at 25mm (bolt head in large gear orientation) though I'm not sure if it will line up properly. I picked 25mm as it's the normal hobb position for the wade extruder and tesseract was using one at 26mm so I figured I'd give it a go. I'll let you know the results once I fit it.
     
    #8 Galaxius, May 11, 2014
  9. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,917
    Likes Received:
    7,338
    All three of the non-stock hobbs I have are slightly differently aligned hobbed sections, but they come with washers that make lining up the hobbed section a breeze (you add washers on one side or the other).

    The one thread Galaxius pointed out has the vendor (jaisol0) who will cut the hobb exactly to match the stock one if that matters to you.
     
    #9 mark tomlinson, May 11, 2014
Thread Status:
Not open for further replies.

Share This Page