PETG sticks to well to PEI - a Solution  

Re: PETG sticks to well to PEI - a Solution

Windex works well if you spray it on the bed, and allow it to dry using heat from the bed.
If you wipe it up with paper, the effect you want disappears.
Windex should leave a thin film that reduces adhesion.

Re: PETG sticks to well to PEI - a Solution

Talcum powder can also be used to 'blind' the PEI

put a little on the build plate, and polish it off using a paper towel, so there is no loose powder left, and the job is done!

works with tpu too!

If PEtG or TPU sticks too well, try a couple of drops of ipa at the corner of your model and let it rest for a while, then try flexing the build plate and hey presto the part should pop off!

regards Joan

Re: PETG sticks to well to PEI - a Solution

Talcum powder can also be used to 'blind' the PEI

put a little on the build plate, and polish it off using a paper towel, so there is no loose powder left, and the job is done!

works with tpu too!

If PEtG or TPU sticks too well, try a couple of drops of ipa at the corner of your model and let it rest for a while, then try flexing the build plate and hey presto the part should pop off!

regards Joan

Yes, the talcum powder is what I use for the TPU filament.

Re: PETG sticks to well to PEI - a Solution

I've been using windex on approximately a half-dozen spools or so of PETG that I've printed. Wipe it down with a windex-dampened paper towel between prints, and as RHDreambox said, let the heat bed dry it. So far I've not had a print I couldn't remove, though my biggest issues are often with small prints, which I can't make effective use of the flex steel sheet to pop the corners off.

Re: PETG sticks to well to PEI - a Solution

I've been using windex on approximately a half-dozen spools or so of PETG that I've printed. Wipe it down with a windex-dampened paper towel between prints, and as RHDreambox said, let the heat bed dry it. So far I've not had a print I couldn't remove, though my biggest issues are often with small prints, which I can't make effective use of the flex steel sheet to pop the corners off.

I had good luck for months, but met my match printing 3DXTech PETG. It's high-temp stuff (270C on 80C bed) and the parts were stuck hard. I managed to tear up one side of my 1st PEI sheet, despite my usual PETG prep of Windex and finger wipes. I went with the gluestick-slathered bed for new hot or sticky materials after that. Have not tried talcum powder, but I did pick up a tube of MagiGoo and it worked perfectly, and was no more complicated to clean up than Windex.

I keep the torn-up side for testing and the other side of that sheet for PETG. Fortunately, I have spare sheets for other printing.

PETG sticks

If PEtG or TPU sticks too well, try a couple of drops of ipa at the corner of your model and let it rest for a while, then try flexing the build plate and hey presto the part should pop off!

I followed that tip but now my sheets is really damaged. Part of PEI was coming with the object.

Cannot say 100% or the damage was already there, but in my opinion it was not damaged before IPA. 

before you started the print, did you use one of the barrier methods to prepare the print bed?

did you try removing the print, before adding IPA? 

regards Joan

Well this is odd, most threads about adhesion are bemoaning the lack thereof.

It's a funny  old world!

regards Joan

RE: PETG sticks to well to PEI - a Solution

Posted by: @nic-2

Hey Guys!
I really like to print with PETG/TPU. It sticks like crazy to the printbed.
Even tho I used only Windex or even nothing to clean before print PETG sitcks to well and I ruined both sides of my smooth PEI sheet.
Since I didn't really find anyhing on google I post it here:

I found a solution:
To increase the bed adhesion for PLA we clean with Isopropanol to remove fat.
So fat/oil should lower the adehsion.

I use 1 Drop of oil(e.g. sunfloweroil) and spread it with a paper towel. The result: A thin but shiny oil coat.
The PETG still sticks good enough but can be popped of just like PLA.

Finding the perfect amount of oil takes a little practise.
(More oil, less adesion and vice versa)

To remove the oil after print use papertowels and for the rest isopropanol with towels.

Other things to handle PETG adeshion:
-higher distance between bead and nozzle(e.g. +0.1mm)
-decrease first layer extrusion width(100% or less)

Same should work with TPU, but I didn't try yet.

Happy Printing everyone!

Find this post easier:
#PETG #welds to bed #sticks #solution #ruined sheet #TPU #adhesion

I'm glad this works for you.  I had an absolutely miserable experience with this method.  I have issues with PETG sticking a little too well to my smooth PEI and textured PEI steel sheets.  I got a paper towel and used a dropper bottle to put the smallest, most minute, fraction of a drop that I could onto the towel.  I then briefly rubbed the paper towel on the steel sheet.  The result was one of the worst experiences I have had with my Prusa since I built it over 3 years ago.  It was an aggravating encounter to watch absolutely NOTHING stick to this steel sheet.  I used 99% Isopropol alcohol to clean the sheet, and still nothing stuck.  In the end, I had to make two trips to the kitchen sink, use a fresh dish rag and dish soap to thoroughly wash the steel sheet.  Two hours later and I finally have a clean first print layer.  I HIGHLY and STRENUOUSLY DISCOURAGE anyone from attempting to use any type of oil on the print surface.  I cursed more tonight that I have in the past 5 years combined.  Hopefully this post will help any future makers avoid the frustration I endured tonight.  Perhaps, I'll try the windex method in the future but NEVER again will I use sunflower oil.  Heck, I don't even want to cook with it now.  Do yourself a favor and leave it in the kitchen and try another method.

RE: PETG sticks to well to PEI - a Solution

Why not just check the documentation and do as suggested there? https://help.prusa3d.com/materials

RE: PETG sticks to well to PEI - a Solution

I know I've been accused of being a shill for this product, but I like it and use it and it works just fine.

When I do PETg prints, I almost always use a coating of Layerneer on the build plate, both on the Prusa, and on my 'other' printer, which uses a glass plate.

It will serve as both an adhesion booster and as a release agent.  With PETg prints, a simple flexing of the plate after a finished print will pop it off.

It also helps to resist warping and curl-up, particularly when break-away supports with a small footprint are used.

RE:

Great reference, thanks for posting

Posted by: @robin

Why not just check the documentation and do as suggested there? https://help.prusa3d.com/materials

RE: PETG sticks to well to PEI - a Solution

Thank you for this suggestion.  I ordered a bottle of it and it arrived yesterday.  I just pulled my first print off the bed and this product is absolutely AMAZING!!!  Highly recommended!  So much easier to use than a glue stick.  I don't think I'll be using anything else from this point forward.  The print was so easy to remove and yet, stuck very well while the bed was warm...

RE: PETG sticks to well to PEI - a Solution

RE: PETG sticks to well to PEI - a Solution

I know I've been accused of being a shill for this product, but I like it and use it and it works just fine.

When I do PETg prints, I almost always use a coating of Layerneer on the build plate, both on the Prusa, and on my 'other' printer, which uses a glass plate.

It will serve as both an adhesion booster and as a release agent.  With PETg prints, a simple flexing of the plate after a finished print will pop it off.

It also helps to resist warping and curl-up, particularly when break-away supports with a small footprint are used.

Thank you for this suggestion. I ordered a bottle of it and it arrived yesterday. I just pulled my first print off the bed and this product is absolutely AMAZING!!! Highly recommended! So much easier to use than a glue stick. I don't think I'll be using anything else from this point forward. The print was so easy to remove and yet, stuck very well while the bed was warm...

RE: PETG sticks to well to PEI - a Solution

I'm glad it worked for you.

One trick that you will also find helpful is that the Layerneer surface can be refreshed, to an extent, for at least a few prints.

Just take an alcohol-soaked rag or paper towel and gently buff it.  The second and third prints will most likely stick just like the first.

RE: PETG sticks to well to PEI - a Solution

Posted by: @jsw

I'm glad it worked for you.

One trick that you will also find helpful is that the Layerneer surface can be refreshed, to an extent, for at least a few prints.

Just take an alcohol-soaked rag or paper towel and gently buff it.  The second and third prints will most likely stick just like the first.

Awesome, thanks for the tips!

RE:

Aren't you the one who said that this was just recycled hairspray?

I found that Got2B Glued works wonders on 3d prints.

RE: PETG sticks to well to PEI - a Solution

Unscented Aquanet hair spray works well as a release agent also.