Hot answers tagged

22 votes
Accepted

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, ...
user avatar
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.
user avatar
10 votes
Accepted

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, ...
user avatar
  • 30.4k
7 votes
Accepted

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 ...
user avatar
  • 6,446
7 votes
Accepted

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 ...
user avatar
  • 2,972
6 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 ...
user avatar
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 ...
user avatar
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 ...
user avatar
6 votes
Accepted

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. ...
user avatar
  • 30.4k
6 votes
Accepted

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. ...
user avatar
  • 3,786
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 ...
user avatar
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 ...
user avatar
  • 30.4k
5 votes
Accepted

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 ...
user avatar
  • 30.4k
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 ...
user avatar
  • 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 ...
user avatar
  • 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 ...
user avatar
  • 30.4k
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 ...
user avatar
  • 30.4k
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 ...
user avatar
  • 355
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 ...
user avatar
  • 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. ...
user avatar
  • 9,792
4 votes
Accepted

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 ...
user avatar
  • 30.4k
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 ...
user avatar
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 ...
user avatar
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 ...
user avatar
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. ...
user avatar
  • 31
3 votes
Accepted

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 ...
user avatar
  • 241
3 votes

How to work with PETG? Settings, caveats, etc

None of your prints look like they are sticking well to the bed. You didn't specify the bed material. For many bed types, you might have success with Aqua Net hair spray. Like any material, if it ...
user avatar
  • 4,398
3 votes

PETG Collecting on the Extruder

For me, none of the classic solutions to PETG zits worked; these include extra retraction, slower/faster retraction, lower extrusion width, lower extrusion multiplier, avoid perimeters etc. It was ...
user avatar
3 votes
Accepted

Does PETG fade in the sun?

tl dr: For the most part, yes it should be color fast in the sun. It should be good for outdoor use. This website claims the following: Filament materials ... for outdoor use include ASA and PETG ...
user avatar
3 votes

Retraction Jamming Problem!

I had problems with jamming PETG due to retraction. My model had many retraction moves, such that the amount of filament used during a printing move was less than the retraction distance. I found ...
user avatar
  • 4,398

Only top scored, non community-wiki answers of a minimum length are eligible