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Why: PEI Sheet for MK3 (Ultem)  

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timo.m
(@timo-m)
Estimable Member
Re: Why: PEI Sheet for MK3 (Ultem)

You need to be signed in to see them. If you still can't find the steel sheets, contact support through chat.

Posted : 28/03/2019 2:32 pm
bobstro
(@bobstro)
Illustrious Member
Re: Why: PEI Sheet for MK3 (Ultem)


[...] My prints just will not adhere now, after six months of great printing. The pei seems to be damaged, but I am terrified of fittedng the replacement pei. The instructions are quite daunting and my dexterity skill are sorely lacking. Thanks.

Not to dissuade you from ordering a spare but... adhesion problems are usually caused by 2 main problems:

  • A dirty PEI print surface. Even if you don't think this is the cause, it's always a good idea to make sure your PEI surface is clean before trying any other fixes. Take it to the kitchen sink and give it a good dunk with Dawn (original formula, no vinegar or hand softener variants) dishwashing soap or your local equivalent (e.g. Fairy in UK). Use a clean paper towel to clean it off, and another to dry it. Avoid using any sponge or cloth that has been in contact with grease. Above all else, avoid touching the PEI print surface. Once it's good and clean, you should be able to use 91%+ isopropyl alcohol between prints, 100% acetone when that fails, and another dunk when acetone fails.

  • . If you have not already done so, try using Jeff Jordan's "Life Adjust" procedure for calibrating your Live-Z setting. It is much easier to use and understand than the on-board routine.
  • Try those 2 steps. If you're uncertain of the Live-Z results, post pics here of the 75x75 print bottom and you'll get quick help. In general, start high (less negative) and work lower (more negative) in large increments (e.g. 0.1mm) until the filament starts to stick on its own. When it's right, you should be able to gently rub it without it coming loose. Then start lowering (more negative) the level until there are no gaps between layers.

    It probably is easier to simply order a replacement PEI flex steel sheet than try to repair a damaged PEI surface. My original was damaged due to overly-aggressive PETG temps and super-adhesion. I've patched the torn spot and am still able to use that side for test prints. The other side is now my official "Sticky Stuff" surface. I have a dedicated 2nd sheet for PLA.

    I've looked into several alternatives to the double-side smooth PEI sheets, but the alternatives are either of poor quality, or end up costing more than ordering from Prusa, even once shipping is taken into account.

    My notes and disclaimers on 3D printing

    and miscellaneous other tech projects
    He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

    Posted : 28/03/2019 3:25 pm
    cwbullet
    (@cwbullet)
    Member
    Re: Why: PEI Sheet for MK3 (Ultem)

    I have stopped replacing my PEI sheets. I buy a new metal sheet form Prusa with it already applied. I take the old one and apply buildtac.

    --------------------
    Chuck H
    3D Printer Review Blog

    Posted : 28/03/2019 5:12 pm
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Why: PEI Sheet for MK3 (Ultem)


    I have stopped replacing my PEI sheets. I buy a new metal sheet form Prusa with it already applied. I take the old one and apply buildtac.

    Do you remove the old PEI surface before doing so? I've got my original flex sheet with one badly torn side I'd like to eventually do something with.

    My notes and disclaimers on 3D printing

    and miscellaneous other tech projects
    He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

    Posted : 28/03/2019 6:30 pm
    cwbullet
    (@cwbullet)
    Member
    Re: Why: PEI Sheet for MK3 (Ultem)



    I have stopped replacing my PEI sheets. I buy a new metal sheet form Prusa with it already applied. I take the old one and apply buildtac.

    Do you remove the old PEI surface before doing so? I've got my original flex sheet with one badly torn side I'd like to eventually do something with.

    Only if the surface is too roght to be flat.

    --------------------
    Chuck H
    3D Printer Review Blog

    Posted : 28/03/2019 8:27 pm
    bobstro
    (@bobstro)
    Illustrious Member
    Re: Why: PEI Sheet for MK3 (Ultem)


    [...] Only if the surface is too roght to be flat.
    Any tips? I'm worried anything I use to remove the damaged side will be equally destructive to the non-damaged side.

    My notes and disclaimers on 3D printing

    and miscellaneous other tech projects
    He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan

    Posted : 28/03/2019 9:51 pm
    AndrewH
    (@andrewh-2)
    Eminent Member
    Re: Why: PEI Sheet for MK3 (Ultem)

    I found a link to order a new steel sheet in another post here. I hope I'll soon be able to restart printing with my beloved prusa soon.

    https://shop.prusa3d.com/en/mk3-printer-parts/216-spring-steel-sheet-smooth-pei.html

    Posted : 29/03/2019 12:17 am
    AndrewH
    (@andrewh-2)
    Eminent Member
    Re: Why: PEI Sheet for MK3 (Ultem)

    Thank you everyone for your helpful advice.

    Posted : 29/03/2019 12:22 am
    cwbullet
    (@cwbullet)
    Member
    Re: Why: PEI Sheet for MK3 (Ultem)



    [...] Only if the surface is too roght to be flat.
    Any tips? I'm worried anything I use to remove the damaged side will be equally destructive to the non-damaged side.

    To remove adhesive, I use Goo Gone and I am very careful to avoid the side I do not want to remove.

    --------------------
    Chuck H
    3D Printer Review Blog

    Posted : 29/03/2019 3:05 am
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