Hotend keeps on Jamming

Discussion in 'E3D-v6 and Lite6' started by Marwijn, Jul 16, 2014.

  1. Marwijn

    Marwijn Member

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    Hello,

    I'm really getting fed up with this hotend, I've been trying for weeks now to get a first print with this hotend, but everytime after a couple of minutes printing the head seems to Jam.
    I'm trying to print with ABS, I tried 240-260 degree, changed the thermisistor (also in the firmware) oiled my filament but is seems impossible to keep printing for longer then a couple of minutes.
    I would appreciate any help with this.

    Kind regards,
    Marwijn.
     
  2. GeoffS

    GeoffS Member

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  3. Marwijn

    Marwijn Member

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    Yes I've read through it. But I can't get it to work. I like the way the hotend looks and it extruder beautifull if it extrudes, but it never keeps it up while printing
     
  4. Sanjay

    Sanjay Administrator
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    Hi Marwijn,

    Looking over your troubshooting form a few things stick out -

    The filament you're using seems to be on the high side of normal diameter, at nigh on 3mm. This is usually fine, but if you have the slightest kink, bend, or area of filament that exceeds that diameter by even a little bit it is going to cause a very sudden increase in friction and resistance. This seems like the first thing to look into, try getting another spool of ABS that 2.85mm nominal.

    I don't know what your thermistor situation is exactly, where it is placed or mounted, but I do know that a standard 100k Epcos thermistor that you're using won't fit into the thermistor hole in the block of a v6. This could well be causing improper readings or similar.

    The use of a non ducted 40mm fan, which although intuitively should work better than a 30mm fan is not always the case. Fans project a tube shaped stream of air, where airspeed is higher at the edges and relatively still in the middle. This means that without a duct your hotend heatsink can be sitting in the dead zone in the middle of the fan flow. This can affect proper cooling.

    Does your heatsink feel warm at all to the touch? Have you tried with the stock duct and fan?

    Some print settings factors to investigate also are:
    Printing at 255C for ABS is really abnormally high. ABS usually likes it around 235-240C on our hotends in our experience.
    A retraction length of 0.000001mm seems a little odd? Try starting out with 0mm retraction and work your way up in 0.5mm increments until you get nice retraction performance. Not exceeding around 4-5mm total.
    Printing with 0.4mm layers and a 0.4mm nozzle, although not a huge problem is probably a bit sub-optimal. 0.30mm layers will probably give you better print quality results in general.

    Hope we can get things sorted for you.
    Sanjay
     
  5. Marwijn

    Marwijn Member

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    Hello Sanjay,

    It seems that using the fan duct made the difference. I had some problems with mounting it, since I couldn't print a mount, but so far the prints have been without jams since. Now I still need to get the speed up (currently at 20 mm/s) and work on the retraction.

    I put it 0.0000001 mm since I couldn't put in 0 for no retraction. I'm using the 0.6 mm nozzle with 0.4 mm layer height.

    Thanks for your help,

    Kind regards,
    Marwijn.
     
  6. Eaglezsoar

    Eaglezsoar Administrator

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    Good job in getting it working!
    Hopefully, with a little tweaking, you will be printing great!
     

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