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Removing PETG from PEI heatbed  

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shane.b4
(@shane-b4)
New Member
Removing PETG from PEI heatbed

I've recently tried printing with Prusa PETG for the first time. My printer works perfectly with PLA. I've given up with ABS for now because of horrible warping and first layer problems. As well as the stink.

My first two prints with PET came out great. Print quality very nearly as good as PLA. Problem is it will NOT come off the PEI heatbed. I've tried letting the print fully cool. I've tried overheating the bed. Tried introducing temperature differentials with ice packs on the print. It just sticks too well and I've caused minor damage to the PEI in order to remove those first two prints.

I've tried using glue stick, and blue painter's tape as well as a combination of the two. I've even tried degreasing blue printer's tape with IPA. All of these have led to a messy first layer. Now the PET doesn't want to stick!

Any tips and tricks?

Posted : 19/08/2018 11:42 pm
RetireeJay
(@retireejay)
Reputable Member
Re: Removing PETG from PEI heatbed

Wash the bed with soap and water, dry it, and apply a coating of glue stick. That's what I do. After each print, I refresh areas that were under the print, and the "intro line" with fresh glue stick. Eventually the bed gets so messy I put it under running water and wash off all the glue stick to start over.
If the first layer is not sticking, adjust your Live Z offset until it does stick. The setting may be different from what you used with PLA.

Posted : 20/08/2018 12:07 am
BillC
(@billc)
Reputable Member
Re: Removing PETG from PEI heatbed

To avoid the mess of glue stick (and a better solution for PETG) after you clean your bed with dishwashing soap and a little water, dry it off, then use Windex or Hair Spray - spray it on the cold bed and let it dry - don't wipe it off. This leaves a small film which stops the PETG sticking too hard.

Don't wipe with IPA between PETG prints, just reapply your Windex/Hairspray and let it dry again.

Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor...
Posted : 21/08/2018 6:58 pm
Dave liked
shane.b4
(@shane-b4)
New Member
Topic starter answered:
Re: Removing PETG from PEI heatbed

Thanks Jay - is the soap and water (rather than IPA) to avoid making the bed too clean and to leave some residue?

Bill - is any window cleaner and hairspray good enough? I'm in the UK and I don't know if we have Windex but I'm sure there's some equivalent.

My printer is tied up with some PLA parts for the next day or so but I'm looking forward to trying your suggestions with the PET soon. Cheers.

Posted : 21/08/2018 10:34 pm
Toots
(@toots)
Active Member
Re: Removing PETG from PEI heatbed

Washing with soap removes stuff that IPA does not dissolve. Also if helps to get rid of that layer of glue from previous prints.

My PETG runs started with glue stick layer. It all worked fine. Did have to trim in the nozzle height, but it comes with higher temps than PLA.
After some prints and adding glue on printed surfaces things turned worse. The first layer became too thin and would not stick anymore. Any bigger surface got nasty wave if it stuck at all. Just my guess but i think the glue layer was too thick.

We dont have windex as a brand around here. But i got the gist of it. Cleaning with IPA leaves clean surface with very little residue. Cleaning with some window cleaning solution leaves some additional layer of chemicals on surface after water and alcohol evaporates. Used some stuff meant for car windows (whatever happened to be in the shed). It worked out nicely. After dialing in the nozzle hight all prints had decent first layer and came off without problems. between prints squirted healthy dose on paper towel. Gave surface a semidirty whipe ( so some residue is left on surface) and it was good to go for new round.

It would be good idea to start with small testprint when testing new ideas. Lot less hassle if the idea is good, but result stick to bed too well.

...
Posted : 22/08/2018 4:23 am
BillC
(@billc)
Reputable Member
Re: Removing PETG from PEI heatbed

Windex is an ammonia based window cleaner, it has a transparent blue color to it.
In the United Kingdom a comparable product is Windolene.
In the Netherlands and in Portugal the equivalent of Windex is Glassex.

source http://www.swannysmodels.com/TheCompleteFuture.html

Bill
Tagaytay City, Philippines
Founder member of Philippines Prusa Printer Owners FB Group
Sponsor Pillars of God Academy in Bacoor...
Posted : 22/08/2018 4:24 am
toby.k
(@toby-k)
Trusted Member
Re: Removing PETG from PEI heatbed

If the bed has cooled, that's when the PEI really grabs hold of the PETG. Try reheating bed to around 60c and it should be easier to pop the print off.

Also on a cold bed, you can try spraying/splashing some IPA around the print and let it sit for a bit...seems that the IPA will work itself under the print and help release it. The IPA trick works really well on my MK3 with the removable sheet when I print with ASA, which I want it to really stick to the PEI due to some corner lift and warping on larger items.

I don't like glue stick (just too messy and a clean up pain). However, the Windex solution works pretty good, but I always seem to forget about it until the print is well underway.

Posted : 31/08/2018 10:05 pm
neroes
(@neroes)
Eminent Member
Re: Removing PETG from PEI heatbed


Windex is an ammonia based window cleaner, it has a transparent blue color to it.
In the United Kingdom a comparable product is Windolene.
In the Netherlands and in Portugal the equivalent of Windex is Glassex.

source http://www.swannysmodels.com/TheCompleteFuture.html

does AJAX "multi action glass spay" also work, i'm in denmark and have none of the above

Posted : 17/02/2019 7:21 am
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(@)
Illustrious Member
Re: Removing PETG from PEI heatbed

A few minutes in a freezer usually helps.

Posted : 18/03/2019 10:32 am
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(@)
Illustrious Member
RE: Removing PETG from PEI heatbed
Posted by: shane.b4

Thanks Jay - is the soap and water (rather than IPA) to avoid making the bed too clean and to leave some residue?

Soap and water is the best clean you can get.  Finger prints don't come off with alcohol, and you can actually transfer more oil from fingers to the bed when you are wiping with an alcohol towelette. 

Soap and water is best on the simple fact you can rinse better. A swab of alcohol does not compare with gallons of hot water.

Here's my bed maintenance recipe:

Alcohol rinse: every few prints

  • Gloves recommended.
  • Once in a while, an alcohol rinse is helpful to remove PLA residue. It does not remove finger oils well.
  • Pour a 5 cm puddle of 91%+ alcohol in the middle of the bed, with clean hands use a fresh paper towel to scrub the bed. Wipe up all the alcohol.

Acetone wash: infrequent

  • Pour a 2 cm puddle of acetone on the bed, scrub it around with a fresh paper towel. It will evaporate fast as you clean. This step removes PEI oxides that form over time and with heat, and improves PLA adhesion to a like new state.

Hot Water wash: often, as needed, and after any of the above

  • Handle the bed only by the edges.
  • Wash the bed in hot water, use a fresh paper towel as a wash cloth, with a few drops of plain dish soap (Dawn, unscented, no anti-bacterial, etc.).
  • Rinse well in hot water - if you have very soft water, rinse a bit longer.
  • Dry the bed with a fresh paper towel.
  • Handle the bed only by the edges.
  • Place bed on printer.

Streak test: when contamination is suspected

  • With a fresh piece of paper towel, and very clean fingers, dampen the towel with 91%+ alcohol, and wipe the bed side to side moving back to front, like you're painting it with alcohol. The alcohol should be thin enough on the towel it quickly evaporates. If you see any streaks, the bed is dirty and needs a wash.

 

Posted : 21/06/2019 11:21 pm
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