Why: PEI Sheet for MK3 (Ultem)  

Re: Why: PEI Sheet for MK3 (Ultem)

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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:

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.

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.

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.

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.

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.

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

Re: Why: PEI Sheet for MK3 (Ultem)

Thank you everyone for your helpful advice.

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.