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First print Prusament PETG  

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Ooj
 Ooj
(@ooj)
Active Member
First print Prusament PETG

Hello, 🙂 

I need to print myself another MMU2 Selector Finda and as the original is PETG I figure I would print a new one in PETG, so having purchased Prusament PETG Orange 😊  I've looked at guides for printing with PET/PETG and blue tape is mentioned, I've seen Windolene mentioned as an adhesive, hairspray. I have a couple of questions regarding print surface as I have a Textured PEI surface,  should I use the Textured PEI print surface, if so, does it need Windolene to be sprayed on to it first?

Thanks in advance for your help. 🙂 

Prusa MK3S with MMU2S
Prusa Slicer 2.1

Posted : 05/01/2020 5:09 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE: First print Prusament PETG
Posted by: @ooj

Hello, 🙂 

I need to print myself another MMU2 Selector Finda and as the original is PETG I figure I would print a new one in PETG, so having purchased Prusament PETG Orange 😊  I've looked at guides for printing with PET/PETG and blue tape is mentioned, I've seen Windolene mentioned as an adhesive, hairspray. I have a couple of questions regarding print surface as I have a Textured PEI surface,  should I use the Textured PEI print surface, if so, does it need Windolene to be sprayed on to it first?

Thanks in advance for your help. 🙂 

Printing PETG with the textured pei sheet works very well with about 230-240degree C nozzletemp and 90degree C bedtemp. No tape and no glue is needed. Very important is a top first layer calibration and absolutly clean bed. Before you remove the printed part, you should let cool down the bed. Maybe use a brim (5-10mm).

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen.

Posted : 05/01/2020 6:51 pm
Ooj liked
Graham A
(@graham-a)
Active Member
RE: First print Prusament PETG

I'm having some similar issues with PETG.  Textured PEI sheet.  I think I've got a clean sheet, but it's hard to say.  

My primary issue:

The skirt isn't sticking well.  When the 2nd layer starts, it lifts the initial skirt off the bed, then proceeds to drag it around the model like a miniature wrecking ball.  I also have some issues with the corners lifting.
Any thoughts on how to fix.  My first layer looks good, but isn't adhering well.  I'm using IPA followed by vinegar/dish soap glass cleaner (I don't have any Windex).  Should I try the glue stick?

Posted : 06/01/2020 1:30 am
rmm200
(@rmm200)
Noble Member
RE: First print Prusament PETG

No glue stick... Should never be needed with PETG.

Switch your skirt with a brim. Skirts are also high temperature solutions.

With nothing to go on - I will boldly say your problems are cleanliness and/or first layer Z.

Start with a good scrub with dawn and copious water. Dry with a clean paper towel. Never touch the print area.

Next, read this:

https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/

Print a good calibration square or circle and post it here. No IPA for this - just the scrub. You can get lots of advice based on how that looks.

Posted : 06/01/2020 2:09 am
Ooj liked
Ooj
 Ooj
(@ooj)
Active Member
Topic starter answered:
RE: First print Prusament PETG

Hello, 😀 

Thank you for your help karl-herbert and robert-rmm200. 🙂 

12 calibration squares of 80x80x0.2, I like the way they show surface deviations of your print surface.  Printing all those calibration squares was a tedious but interesting time and having done that I think I have found a sweet spot.

I used the Prusament PETG material preset in Prusa Slic3r to print all the calibration squares.

I now have a replacement MMU2 Selector Finda. 😀 

Prusa MK3S with MMU2S
Prusa Slicer 2.1

Posted : 06/01/2020 9:41 pm
Graham A
(@graham-a)
Active Member
RE: First print Prusament PETG

Doing some experimenting, I was definitely too high by about 0.05mm, which was giving me adhesion issues between layers.  Going lower has definitely fixed that.  

The upper left is -1.400 (good?), the middle strip is -1.500 (too low), and the lower-right is -1.450 (still looks low).  I'm running another with -1.375 (looks too high initially), and -1.425 (looks ok).  It looks like my setting should be somewhere around -1.400, I'm going to look at the -1.425 sample and decide if I want to be at -1.400 or -1.410 or -1.415.  

Posted : 07/01/2020 4:31 am
bobstro
(@bobstro)
Illustrious Member
RE: First print Prusament PETG
Posted by: @robert-rmm200

[...] No glue stick... Should never be needed with PETG.

In general, agreed. Just a cautionary note that some high-temp PETGs (e.g. 3DXTech) prints at 270C and will definitely require some sort of separator beyond the usual Windex or finger grease. I lost my 1st PEI stick sheet to the stuff. Glue stick or MagiGoo may be needed for exotics.

 

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 : 07/01/2020 4:44 am
XV
 XV
(@xv)
Active Member
RE: First print Prusament PETG

For prints where I was having some tear up or adhesion issues, I set the bed temp a little higher (90 for PETG) for the first layer and used the manual feed rate override to slow things down.  It may be overkill but I usually wind it down to about 70%.  Once I started doing these things, I've not had any issues.  As a result of investigating another issue, I see know that PrusaSlicer has a Printer First Layer speed override that I'll start using from here on out.

Posted : 08/01/2020 12:07 am
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