22
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Why keep the bed heated after initial layer(s) with PLA (or PETG)?
There are three reasons (I can think of):
A large problem you'd face with allowing the bed to cool after first layer is you stand the chance of losing adhesion after it cools. When you heat the bed, ...
- 2,423
12
votes
How to work with PETG? Settings, caveats, etc
Slow down!
80 mm/s is much too fast for PETG. Try 45 or 50 mm/s instead, even for infill, supports, and other less-visible areas.
- 2,164
10
votes
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PETG layer adhesion
What you describe is usually the result of using a too high of a part cooling fan rotational speed. Like ABS, PETG doesn't require much cooling (if needed at all that is). If you do cool too much, ...
- 33.1k
7
votes
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PETG Collecting on the Extruder
Different brands and blends of PET filaments seem to do this to different degrees. Esun's PETG is definitely one that tends to glob onto the nozzle. Basically, the nozzle plows through the top surface ...
- 6,496
7
votes
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Is PETG filament food safe?
Many manufactures list their filaments as being food safe, but I would not treat this as "gospel truth". Apparently, the FDA considers PETG to be safe for food contact, but they are probably thinking ...
- 3,042
7
votes
PETG layer adhesion
While 0scar was right that cooling fan hurts layer adhesion, I've continued to have problems with PETG even with no fan, regardless of temperature. I went looking for advice on the topic, and found a ...
7
votes
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Can PETG be used as support material for PLA?
PETG works as support material for PLA, see video
In theory, PLA printed on top of PETG will be fine because PETG softens and gets sticky at higher temperatures.
...
- 3,958
6
votes
Can I dry PETG filament under sun?
Here is my suggestion for a cheap, well and temperature accurate drying manner of a filament. I've done it several times for PETG that is actually a very moisture absorbing filament and pops it up ...
6
votes
Accepted
Can I dry PETG filament under sun?
The simple answer is: No
There are two basic reasons for this:
The sun will not get the filament hot enough to evaporate any moisture which has been absorbed.
While sitting out in the sun, it will ...
- 2,423
6
votes
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Question about retraction distance and stringing/print quality with PETG
You cannot endlessly increase the retraction distance, doing so leads to different problems as you encountered. As a rule of thumb, the retraction distance should not exceed the length of your nozzle. ...
- 33.1k
5
votes
How to work with PETG? Settings, caveats, etc
The Ender 3 can print PETG alright - in some regards, such as warping and adhesion issues, even better than PLA. But you do need the right settings. 230-240 °C is too low, especially at the ...
5
votes
Accepted
How to level bed after applying glue stick for bed adhesion
How much glue do you put on it? I use PVA based spray, barely visible, very evenly spread and no problem whatsoever of sticking paper to the glue layer.
Just level the bed as you normally would and ...
- 33.1k
5
votes
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Bumpy first layer with PETG
One thought I had, does PETG need a different clearance between the nozzle and the bed than PLA?
Short answer: "Yes, for some it does".
The results from your image are typically seen when the ...
- 33.1k
5
votes
Accepted
What is the best technique to improve removing PETG from the print bed?
Playing around with the nozzle height will help: back it off until just before you have first layer adhesion issues. Don't jam the filament into the bed as you might for ABS. This helps with small ...
- 198
4
votes
PETG Sticking to Nozzle
It could be that you're having issues now due to the filament absorbing moisture. I had a big problem with it doing that when I had waited for a few months after opening my filament. Dehydrated it ...
- 41
4
votes
PETG layer adhesion
PETG doesn't bond well if the layers aren't both at a fairly high temperature, as noted by the other answers. As mentioned, try reducing or simply turning off layer cooling. Additionally, try printing ...
- 876
4
votes
Messy top layer with PETG filament?
Five top layers should normally be more than enough to create a seamless top layer.
Indeed, PETG prints a little differently than PLA. It requires a higher hot end temperature, less part cooling (to ...
- 33.1k
4
votes
Accepted
PETG filament doesn't stick reliably to fake Buildtak surface
I have printed kilometers of PETG and found the sweet-spot for my brand to be 240 °C for the hotend and 70 °C for the build plate (for my Ultimaker 3 that is, the extruder temp is 5 °C ...
- 33.1k
4
votes
Accepted
PETG nozzle clearance and extrusion multiplier
Here is the mental framework that I use to reason about PETG: In a nutshell you want to avoid nozzle contact.
Unlike most other plastics, PETG sticks to hot brass really well and every time the ...
- 375
4
votes
Accepted
PET-G under-extrusion after changing the nozzle to a 1.2 mm d. one (Prusa i3 mk3s and PrusaSlicer v2.0)
Piecing this answer together from the comments on OP's post.
Myself and R.. noted that a layer height of 0.35 mm, nozzle width of 1.2 mm, and a fairly high feedrate (200 % according to ...
- 876
4
votes
Accepted
Does acid dissolve PETG 3D prints?
According to kmac-plastics, PETG is stable at temperatures below 50°C specifically for citric acid (also acetic acid) and others on the linked list. It is also safe with diesel oil and many alcohols. ...
- 11k
4
votes
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Thermal runaway with specific prints
Thermal runaway protection (see What is Thermal Runaway Protection?) is triggered when the scheduled voltage to the heater element does not result in a specified increase in temperature within a ...
- 33.1k
4
votes
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Why does PETG require slower speed?
I'm adding this answer to somewhat challenge the findings of my original answer, and the premise of the question: PETG does not need lower print speeds, and can even be printed at higher speeds than ...
4
votes
Accepted
Flat print blobbing and scuffing with PETG on Ender 3 Pro with Microswiss AMH/DD
Are you sure the 130 E-steps is correct for your extruder? You don't mention what extruder you're using, but presumably, it's something other than just moving the original extruder to a direct drive ...
4
votes
Accepted
Can the Ender 3 Pro be upgraded to use PETG
No hotend upgrade is required to print PETG on an Ender 3 (pro or any other variant). The stock hotend can be used at temperatures up to 250 ˚C, and 230-245 ˚C is the range typically recommended for ...
4
votes
Is PETG sensetive to moisture?
Here are some pics I took a while back of a test piece, single-wall cube with no infill, before (right) and after (left) drying PETG:
and again without flash:
As you can see, the undried filament ...
4
votes
Accepted
Thick stringing next to a perfectly printed model
225°C is way too cool to print PETG, especially at 60 mm/s if your printer's extruder is similar to the Ender 3's stock extruder (going off what you said; I'm not familiar with your specific printer). ...
3
votes
Accepted
Prusa i3 MK3S 3D printer PETG printing problems
230 °C is way too cool for PETG and will result in underextrusion unless you print really slow, and poor bonding. Underextrusion in turn leads to stringing because of pressure build-up. I print ...
3
votes
How to work with PETG? Settings, caveats, etc
I just made an account to point out that you will scorch your PTFE tube if you listen to anyone here telling you to print at 250+ C. I have done this, it is a bad idea without an all metal hotend.
...
- 31
3
votes
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How to work with PETG? Settings, caveats, etc
The real problem was that I damaged the nozzle (most likely while cleaning it) in a way that increased the size of the hole. So, too little filament was coming out of too big of a hole, which caused ...
- 291
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