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PETG Printing on Smooth Sheet Help  

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egar
 egar
(@egar)
Estimable Member
RE: PETG Printing on Smooth Sheet Help

@diem

Thanks for the wet paper towel suggestion.  I'll give that a try.  Until now, I've been spreading a very thin layer with my finger only.

Posted : 06/05/2021 2:26 pm
John
 John
(@john-6)
Reputable Member
RE: PETG Printing on Smooth Sheet Help

@tim-2

So is the general opinion that ammonia is the key chemical to act as the release agent? Some glass cleaners dont have NH3 and it would be interesting to know if these work too. Likewise I am also wondering if reference to windex is as a generic term like hoover.

cheers John

i3 Mk3 [aug 2018]...
Posted : 11/05/2021 3:14 am
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 --
(@)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help

@john-6

I'm not a chemist, so I am guessing here (well, semi educated opinion). Since ammonia evaporates at fairly low temps, my guess is the other surfactants in the Windex are what keeps the PETG off the surface. Think dry soap scum. Windex is preferred because it is self leveling when compared to glue sticks, and easier to clean up. 

In a pinch, I'll even use fingerprints to avoid strong adhesion. Yep - full hand prints rubbed all over the bed, and a dab of alcohol to even out the oil. It works fairly well - sometimes too well - I've had PETG prints detach when using this method. lol. 

 

Posted : 11/05/2021 4:20 am
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help

From experience, I can confirm the finger / hand print technique.  I mistakenly liked on to this.  Windex is my preferred, but I have tried the we towel and glue stick.  There are many ways to skin this cat.  Juts find one and use it.  

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Chuck H
3D Printer Review Blog...
Posted : 11/05/2021 9:36 am
John
 John
(@john-6)
Reputable Member
RE: PETG Printing on Smooth Sheet Help

@cwbullet

I guess my question was - will any window cleaner work or does it need Ammonia. To be honest I dont want to make a rookie mistake  on a new print bed ( geckotek) and window cleaner certain sounds the easiest.

i3 Mk3 [aug 2018]...
Posted : 11/05/2021 9:59 am
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help

@john-6

It happens to all of us.  Ammonia is needed.  

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Chuck H
3D Printer Review Blog...
Posted : 11/05/2021 10:00 am
John
 John
(@john-6)
Reputable Member
RE: PETG Printing on Smooth Sheet Help

a little contradictory to @Tim-2 if I read his post correctly but I guess the safe printing thing is to get the ammonia one - but it isn't a great chemical to use

i3 Mk3 [aug 2018]...
Posted : 11/05/2021 10:03 am
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help

@john-6

Ammonia in window cleaner is plenty safe.  I wouldn't huff it, but a spray in 3d printing will not hurt anything.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 11/05/2021 10:13 am
fuchsr liked
Hunter328
(@hunter328)
Active Member
Topic starter answered:
RE: PETG Printing on Smooth Sheet Help

Thanks again for all of the help!

Is it possible to use too much Windex? I haven’t had time to do much tinkering, but the first two test squares I’ve done trying to get the z axis calibration correct, the PETG has been lifting up off of the print sheet.

The test squares (in case anyone doesn’t know) puts down a thick outer square perimeter, then a thinner inner square. It then prints straight lines at a diagonal to fill up the inner square.  
The lifting is occurring at points where the lines meet the inner square.  This messes up each following line until it gets to a point where the lines are smaller than where it messed up and it can reconnect with the inner square.

I hope that made sense.

This being the first time I’ve tried anything besides PLA, and not having had any trouble printing with PLA, I’m not sure what part of what I’m doing is causing this to happen.

If anyone has any ideas, I’d love to hear them?

Posted : 11/05/2021 1:18 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help
Posted by: @hunter328

Thanks again for all of the help!

Is it possible to use too much Windex? 

yes.  A light spray and wipe is all that is needed.
--------------------
Chuck H
3D Printer Review Blog...
Posted : 11/05/2021 8:34 pm
nochkin
(@nochkin)
Active Member
RE: PETG Printing on Smooth Sheet Help

Besides Windex I would suggest another option is to use a regular masking tape. Nothing else is needed when you have that.

It sticks well with PETG during printing and it's comparable easy to remove your print after it's done.

Posted : 14/05/2021 4:17 am
cwbullet
(@cwbullet)
Illustrious Member
RE: PETG Printing on Smooth Sheet Help

@nochkin

I have not tried that recently.  A great addition to the thread! 

--------------------
Chuck H
3D Printer Review Blog...
Posted : 14/05/2021 9:29 am
nochkin
(@nochkin)
Active Member
RE: PETG Printing on Smooth Sheet Help

@cwbullet,

I actually started using the masking tape on a glass bed about 2-3 months ago. I used to use a glue stick before.

I print mostly using PETG and it's been a great result for me. PLA/PLA+ sticks too.

No need for any glue stick or anything like that. Once removed, it's clean, dry and ready for a new print.

A few time I ripped off the tape when removed the print, but that's easy to replace. I just purchased a big roll of the widest available tape to make it easier to apply.

I don't even bother re-leveling the bed when I replace the tape, but I had to do it when installed it for the first time, of course.

Posted : 14/05/2021 3:57 pm
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