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Unresolved Failed Overhang

Discussion in 'Troubleshooting' started by spankurmonkey, Feb 16, 2017.

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  1. spankurmonkey

    spankurmonkey Member

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    The left was my first attempt ... the right is the second attempt... I am printing a third now and made change to the extrusion width and then changed outline direction to outside-in
     

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    #21 spankurmonkey, Feb 17, 2017
  2. Geof

    Geof Volunteer Moderator
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    Looks to hot/cooling issue my friend.
     
    #22 Geof, Feb 17, 2017
  3. spankurmonkey

    spankurmonkey Member

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    so a lower extrusion temp? or your saying I need a different fan set up... you have a robo... what sort of fan set up do you have??
     
    #23 spankurmonkey, Feb 17, 2017
  4. Geof

    Geof Volunteer Moderator
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    I use two 12vdc fans 40x40x10 evercool brand. Both use the too small fix tooless fan ducts on thingiverse.(all my 3d printers use a cooling fan duct that directs air in one way towards the print)
     
    #24 Geof, Feb 17, 2017
  5. spankurmonkey

    spankurmonkey Member

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    #25 spankurmonkey, Feb 17, 2017
  6. Geof

    Geof Volunteer Moderator
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    What is your set up? E3d or hexagon? 30 or 40 watt heater ?
     
    #26 Geof, Feb 17, 2017
  7. spankurmonkey

    spankurmonkey Member

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    Its all stock.
     
    #27 spankurmonkey, Feb 17, 2017
  8. Geof

    Geof Volunteer Moderator
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    #28 Geof, Feb 17, 2017
  9. spankurmonkey

    spankurmonkey Member

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    I have not tried those.... so in your opinion you think the issue is a cooling issue at first glance.

    the fan I have is a wrap around with a 50mm radial.
     
    #29 spankurmonkey, Feb 17, 2017
  10. Geof

    Geof Volunteer Moderator
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    I personally think those style ducts restrict air flow and do not help. I tried them and quit using them. I also used the black widow fan ducts and the worked well as well.
     
    #30 Geof, Feb 17, 2017
  11. spankurmonkey

    spankurmonkey Member

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    #31 spankurmonkey, Feb 17, 2017
  12. Geof

    Geof Volunteer Moderator
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    I used this one, 40x40x10mm fans
     
    #32 Geof, Feb 17, 2017
  13. spankurmonkey

    spankurmonkey Member

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    OK guys..... I am reaching a high level of frustration with my printer and trying to figure out this overhang issue. Last night I ran another print but just a simple overhang (30 degrees to 55 degrees) test. I positioned the little overhang block in several places on my bed.

    Starting with the square position of blocks
    • The one facing the front of the printer (failed 30 degrees)
    • The one facing to the right of the bed (failed 45, 40, 35, 30 degrees)
    • The one facing to the back of the bed (failed 30 degrees)
    • The one facing tot he left of the bed (failed 45, 40, 35, 30 degrees)
    • The one positions by itself facing to the right of the bed (failed 45, 40, 35, 30 degrees)
    So clearly as you guys say there is a cooling issue.... I know Geof has suggested a fan switch which I will try today but I have to ask... are most of you running the stock Hot End or did you change and if you change to something like the E3d-V6 what setup are you using for your fans? If switching out the HotEnd will not only benefit me in the ability to print other filament types but results in a better cooling set up I am open to making the upgrade.
     

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    #33 spankurmonkey, Feb 18, 2017
  14. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    First off, if you are still set for Outside to Inside on perimeters that will be an issue for overhangs, depending on the extrusion width and angle of overhang you may have nothing supporting the outside extrusion. Also layer height plays a vital roll. The lower the height the more angle you can overhang. If you want easy, let a service print it for you. Otherwise Spanky, suck it up and tinker some more! :p
     
    #34 WheresWaldo, Feb 18, 2017
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  15. spankurmonkey

    spankurmonkey Member

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    The print I just mentioned you are correct it was Outside-in and layer height was .20 - I am willing to tinker but I have no clue in what settings to change other than going back to inside-out.
     
    #35 spankurmonkey, Feb 18, 2017
  16. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
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    I am using E3D hotends on every printer I have (including the delta) except for the new C2. That is the only one I left with Hexagon.


    edit: and no as @WheresWaldo points out this is not you main issue. There are reasons to upgrade, but this is not one.
     
    #36 mark tomlinson, Feb 18, 2017
    Last edited: Feb 18, 2017
  17. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    Hotend is not the issue!

    Reprint with the following adjustments ONLY!
    1. Change layer height to 0.10 mm
    2. Slow your printing down by about 25-30%
    3. Change perimeters back to inside out
    4. Report findings
     
    #37 WheresWaldo, Feb 18, 2017
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  18. spankurmonkey

    spankurmonkey Member

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    What extrusion width should I use.. Auto or a set value? in regards to speed my default speed is 30mm/s
     
    #38 spankurmonkey, Feb 18, 2017
  19. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
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    You can set it back to auto if you want.

    At 30 mm/s you are already printing slow enough.
     
    #39 WheresWaldo, Feb 18, 2017
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  20. Geof

    Geof Volunteer Moderator
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    Its defianently a cooling issue. Slow the print down, drop your extrusion temperature a bit, ditch the duct you have and go back to the stock fan mount and position your overhang so the fan is blowing on it while printer. So print orientated towards the x axis. That may help

    Edit: if @WheresWaldo setting changes above dont fix it all the way
     
    #40 Geof, Feb 18, 2017
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