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How do I replace the threaded filament tube that holds the print head?

My print head got ruined by a leak, so I ordered a replacement which finally arrived, and I managed to get the old head off without damaging the thermal elements, but the threaded tube is damaged.
The replacement came with a new tube, but I can't get the old one out to replace it, am I missing something? I can't see anything else holding the tube in place, but it won't unscrew at all. 

20190325_152814.jpg
4032 x 3024 - 4M
20190325_152754.jpg
4032 x 3024 - 4M
20190325_152802.jpg
3024 x 4032 - 4M

Comments

  • Der_MuckDer_Muck 🌟 Super Member 🌟 Posts: 215
    Heat it up to the point where the filament softens. Unscrew the screws of the tube, situated on the second photo left up the tube on the side, next to the bearing. You can see the holes in your photo. 
    Thanked by 1Samuel Pinches
  • SparksSparks Member Posts: 7
    There are no screws in those holes, and I can't heat it up because the heating element is waving around in thin air.
  • Der_MuckDer_Muck 🌟 Super Member 🌟 Posts: 215
    Normaly there should be min. 1 M3 setscrew in there there are 2 or 3 holes. Remove the metal cover to check it.
    Use a hot air gun to heat it up. But first you have to dismantle the whole cold end otherwise you melt or destroy something. You can use 2 M6 nuts counter screwed to get the throat out without destroing the thread.
    Thanked by 1Samuel Pinches
  • Laser8302Laser8302 Member Posts: 20
    Watch this video on how to get the throat out of the cold end:



    Thanked by 1Samuel Pinches
  • Der_MuckDer_Muck 🌟 Super Member 🌟 Posts: 215
    On minute 1,04 you see the screw I ment, you said it wasnt there, did you find it? Thought there where 2 of them.
  • SparksSparks Member Posts: 7
    edited April 7
    Sorry for the long delay, I've been trying to follow this video, but this head is different from mine, rather than 2 holes of the same size, mine has 3 holes of different sizes.
    I extracted the screw from the middle hole, and the larger and smaller holes don't seem to have screws in, though the smaller one is threaded as if it should have, but the tube still won't come out.

    Post edited by Sparks on
  • Samuel PinchesSamuel Pinches Administrator Posts: 1,536
    isnt that third one to mount the fan cover? are there any screw holes on the other side?
  • SparksSparks Member Posts: 7
    edited April 7
    I suppose it could be, but there was no screw holding the fan cover to it. 
    The only holes on the other side were the ones holding the fan cover on there, which I've undone. 
    Post edited by Sparks on
  • Der_MuckDer_Muck 🌟 Super Member 🌟 Posts: 215
    edited April 7
    @Samuel Pinches
    You mean the other side, here is only one screw yes thats right the one in the middle.

    Hope you try to unscrew it while it is about 250Β°C hot, otherwise nothing will get ever lose there.
    Post edited by Der_Muck on
  • SparksSparks Member Posts: 7
    I'm not sure what you mean, this video clearly shows it being unscrewed with bare fingers, and with the element removed, definitely not while hot, and the 2 screws they remove in it are on the side where mine has the 3 different holes.
  • Laser8302Laser8302 Member Posts: 20
    There were 2 set screws on my printer. The whole tube is 26mm long if that helps.

    There were 2 set screws on mine. I would think all are the same in this case.
  • Samuel PinchesSamuel Pinches Administrator Posts: 1,536
    Mine had two set screws too... maybe look down with a torch into those holes... maybe one has stripped?
  • Der_MuckDer_Muck 🌟 Super Member 🌟 Posts: 215
    I can say that there is only one screw, I have my secound printhead her on the table.
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