need to re-coat both sides of two of my smooth PEI steel sheets
 

need to re-coat both sides of two of my smooth PEI steel sheets  

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MartyS
(@martys)
Trusted Member
Posted by: @bobstro

I can't bring myself to throw the old one away. So there it will sit, looking at me with those sorrowful eyes.

Ah yes, it is a difficult thing to throw away something you know you can fix, as you take it to the bin it calls out "I can be like new again, save me!".  So it goes back on the shelf or in the drawer, only to wait and cry out the same thing again someday....  😆 

Posted : 09/01/2021 5:58 am
mrstoned
(@mrstoned)
Estimable Member

I may be way off, but would it work to go over the surface with a 4-600grit sandpaper to smooth it over and just reapply the new surface on top?

Especially if the new surface is abit thicker?

Flsun QQ-s "pro". Tevo Nereus. Prusa Mini+ KIT on order....
Posted : 09/01/2021 10:58 am
cwbullet
(@cwbullet)
Illustrious Member

If you are at whits end and considering the trash, try a splash of acetone.  I pour one one ml of acetone and spread it around with a paper towel.  I wipe if off immediately and then wash the bed with IPA.  For me, it has stored the bed's stickiness and if it ruins it, who cares because I was tossing it anyway.  To me, it resets the PEI.  It has been 100% successful on 4 old beds.  I am about to treat 2 of them again after 6 months of reset.  

 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 09/01/2021 7:08 pm
bobstro
(@bobstro)
Illustrious Member
Posted by: @mrstoned

I may be way off, but would it work to go over the surface with a 4-600grit sandpaper to smooth it over and just reapply the new surface on top?

Especially if the new surface is abit thicker?

I have seen suggestions to fill the gaps in a torn PEI surface with gluestick. I did patch my hole temporarily with a cutout of blue painter's tape. Applying a fresh PEI surface over that might work, but I think you'd be risking a new sheet to save an hour's work.

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 : 09/01/2021 7:38 pm
MartyS
(@martys)
Trusted Member
Posted by: @mrstoned

I may be way off, but would it work to go over the surface with a 4-600grit sandpaper to smooth it over and just reapply the new surface on top?

Especially if the new surface is abit thicker?

  If you mean putting a 2nd PEI sheet over a damaged one, the issue there is the PINDA probe.  You'll end up with 2 layers of PEI and 2 layers of adhesive, that may put the print surface too far away from the steel for the PINDA to sense it.

 I agree on the acetone treatment, only reason to throw away a PEI sheet is physical damage, acetone will rejuvenate it's stickiness very well.

Each acetone treatment makes the PEI a little more brittle and prone to damage, so it is best to only use it as a last resort.

Posted : 09/01/2021 9:02 pm
mrstoned
(@mrstoned)
Estimable Member
Posted by: @martys
Posted by: @mrstoned

I may be way off, but would it work to go over the surface with a 4-600grit sandpaper to smooth it over and just reapply the new surface on top?

Especially if the new surface is abit thicker?

  If you mean putting a 2nd PEI sheet over a damaged one, the issue there is the PINDA probe.  You'll end up with 2 layers of PEI and 2 layers of adhesive, that may put the print surface too far away from the steel for the PINDA to sense it.

 I agree on the acetone treatment, only reason to throw away a PEI sheet is physical damage, acetone will rejuvenate it's stickiness very well.

Each acetone treatment makes the PEI a little more brittle and prone to damage, so it is best to only use it as a last resort.

Yes, given that most have offsetvalues in the -0.5 to -1 a 0.1 or 0.2 pei sheet wouldnt make much difference?

Flsun QQ-s "pro". Tevo Nereus. Prusa Mini+ KIT on order....
Posted : 09/01/2021 11:55 pm
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