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My Printer

Discussion in 'Show and Tell' started by Thamer Albahiti, Oct 31, 2013.

  1. Thamer Albahiti

    Thamer Albahiti Active Member

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    ok,
    i connected the burnt part with soldering, couldn't get a wire to stick
    properly isolated the copper head of the extruder
    i turned on the printer and realized there is heat coming from the hot end
    i connected Repetier (was closed) and saw the temp at 120 and rising.
    i tried to stop it at 140 but it kept going
    tried to turn on/off the extruder heat. nothing happened.
    so i turned off the printer

    what did i do wrong ? did i bypass something ? or is there another part that got affected and i need to change ?
     
  2. Mike Kelly

    Mike Kelly Volunteer

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    Like I said your MOSFET failed open. You need to replace it before continuing. Every time your 12v is on it'll bypass the mosfet and heat until you do.
     
  3. Thamer Albahiti

    Thamer Albahiti Active Member

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    just to be sure, it's the one on the burnt connection only ? not both correct ?
    and it's with the same specs you linked here
     
  4. Mike Kelly

    Mike Kelly Volunteer

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    Yes just the one near the burnt trace. That's the only one I replaced. You should verify your fan and hbp (if you have one) are functioning. Just be sure you unplug your heater so you're not heating it up as you test these.

    That's the MOSFET i purchased and described in the RAMPS 1.4 schematic http://reprap.org/mediawiki/images/f/f6/RAMPS1.4schematic.png
     
  5. Thamer Albahiti

    Thamer Albahiti Active Member

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    the site you linked is funny
    it's charging $1.66 for the Mosfet and $120 for delivery. lol
    i found one on ebay shipping from the UK
    but estimate delivery is 20 Dec.
    ...sigh
     
  6. Mike Kelly

    Mike Kelly Volunteer

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    Yeah I didn't expect you to buy from mouser, just linking to the part file so you knew exactly what to get.
     
  7. Thamer Albahiti

    Thamer Albahiti Active Member

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    still waiting for my damn MOSFET

    estimate delivery was end of December :(
     
  8. Thamer Albahiti

    Thamer Albahiti Active Member

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    what other values of Mosfet can i use ?
    does it have to be the one and only ? i ordered it but its taking ages to get here....if it gets here...
     
  9. Mike Kelly

    Mike Kelly Volunteer

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    There's probably other options but that's the best choice. Are there not distributors in UAE (I think thats where you are right?)
     
  10. Thamer Albahiti

    Thamer Albahiti Active Member

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    i ordered one from ebay, but its shipping from the UK and will take long. if it even gets here
    the bastards want me to make an order of 50 pcs
    and if i want to rush it, i have to pay $150 extra
    basically he's saying, pay me as if i made the order and sold all of them. ripoff
     
  11. Mike Kelly

    Mike Kelly Volunteer

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    That sucks man. I think digikey has worldwide distributors. Maybe something closer to you.
     
  12. Thamer Albahiti

    Thamer Albahiti Active Member

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    I have a question,
    can i take the Mosfet from D9 (heat bed?) and use it for the hot end ? i didn't check the values on it if its the same or not.
    but if it is, there shouldn't be a problem right ?

    i'll be printing with PLA so i don't think i'll be needing the heat bed for a while
    my mail order of the mosfet seams to be lost somewhere. gonna have to order another one from someone that would ship with FEDEX or DHL just to make sure it gets here

    hope it's possible, as my printer is just gathering dust in a corner
     
  13. Mike Kelly

    Mike Kelly Volunteer

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  14. Thamer Albahiti

    Thamer Albahiti Active Member

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    hello again,

    i've been away for a while.
    i managed to break one end of the resistor on the standard hot end.
    anyone have any idea what the Values are for it ?
     
  15. Thamer Albahiti

    Thamer Albahiti Active Member

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    after waiting for 12 months to get my replacement smooth rod supports and coupler i replaced them
    but when i was putting the hot end rail back i managed to ruin the ball bearings on the smooth rod.
    lucky F*cken me
    not its not moving properly and it gets stuck. another year of waiting coming ahead
     
  16. SteveC

    SteveC Well-Known Member

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    Not sure where you live but those are standard LM8UU bearings and can be bought online many places cheaply. No way you would need to wait a year.

    completely random examples from Ebay and Amazon:
    http://www.ebay.com/itm/like/201112655141?lpid=82

    http://www.amazon.com/6pcs-LM8UU-Linear-Bearing-Bushing/dp/B008RIKN7W
     
  17. Thamer Albahiti

    Thamer Albahiti Active Member

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    Thank you for for your help.
    will try to find them locally if not, ebay it is
     

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