PETG print problem

[JOEPRO]

Ive tried this print 4x times now and get the same issue. Poor print and some sort of delamination-



I have tried reducing the air temp inside my flashforge Adventurer 5m from the 50c or so to 30c no difference. I have tried 3x spools of black PETG all dry and no difference. I have tried re orientating the part so the top part prints flatter but the same issue moves to other areas of fhe print. 0.4mm nozzle, fine and standard settings dont seem to make a difference either.

Any ideas on what I can improve setting size etc please as to what may be causing this?

 

[dieselsamurai]

PETG is horrible to print in , Ive just done 2 M41A Pulse Rifles from Aliens in it and was a nightmare. May be print speed too fast or temperature at the nozzle too low at a guess

I find PLA+ more than strong enough and so much easier to get quality prints

 

[m_c]

I'm assuming that you're drying the rolls yourself?
Fresh rolls are rarely that dry.

Given where the rough areas are, I'd probably look at the print temp and retraction settings.

 

[Onoff]

PETG is horrible to print in

I know what you mean but would have to somewhat disagree. In the Bambu X1C they are pretty damn good with reels straight from the shipped packet.

Using the dryer here on top is a game changer. The prints are very nearly on par quality wise with PLA. Very little if any stringing.

We print more in PETG than anything else.

 

[Onoff]

My lad keeps his rolls inside ziplock bags with desiccant sachets. They whole lot sits in a sealed plastic Celebrations tub. The AMS itself is filled with desiccant granules in custom printed pockets.

That was as good as it got until the filament dryer came and the difference is night and day.

 

[MattF]

I'm assuming that you're drying the rolls yourself?
Fresh rolls are rarely that dry.

I've started putting new rolls of PETG through the dryer as a matter of course. For some peculiar reason, black always seems to look worse on print quality than any other colour.

 

[ajlelectronics]

PETG is horrible to print in

Not the case. I use it almost universally and never an issue.PLA on the other hand...

 

[MattF]

Not the case. I use it almost universally and never an issue.PLA on the other hand...

I generally never have much problem with either. I simply dry PETG now as I noted what I class as excess stringing, out of the packet. Drying helps with that.

 

[Onoff]

Not the case. I use it almost universally and never an issue.PLA on the other hand...

PLA here has always printed "the best" on both the old Anycubic, open bed slinger and the new, enclosed, core XY Bambu.

 

[JOEPRO]

It's not a drying issue I have proper storage bags and I run even new rolls through my drier before and during printing regardless. Its not stringing its the print surface being very poor and delaminating

Ill try different infill settinfs (Gyroid at the moment) and see what else I can adjust to try and figure out the issue.

 

[dieselsamurai]

Not the case. I use it almost universally and never an issue.PLA on the other hand...

Ok I should clarify on my old creality printer with no enclosure and a marginal operator i found it pain to set up but did end with good results in the end , I just find for a marginal user PLA+ suits my basic needs and has been strong enough so far

 

[JOEPRO]

PLA+ prints easier in my Adevturer 5M also. But I have found it to warp quicky when exposed to heat despite the claims it can cope with heat. It's not much better than regular PLA.

Since this is a car heater duct I need at least PETG for heat resistance. Ive had poor results with ABS hence sticking with PETG this time around.

 

[dieselsamurai]

Yeah for heat applications makes sense

 

[MattF]

Is it just that one print you're having issues with? All other prints come out fine?

 

[JOEPRO]

Is it just that one print you're having issues with? All other prints come out fine?

Most other prints in PETG, whilst smaller, do come out fine yes. This one seems particularly problematic

 

[daedalusminos]

Looking at where the problem is on the print I'd say something feature related...e.g retraction/purging

 

[MattF]

Most other prints in PETG, whilst smaller, do come out fine yes. This one seems particularly problematic

If you wish to send me the stl file, I can try it here & see how it turns out. May help you narrow things down, a bit.

 

[Screwdriver]

I only use PETG and at first glance I would say nozzle temperature too low. I run mine all the way up to 250ºC.

But your print looks good in some parts and terrible in others so I would suspect a heating element failure. As if the nozzle is sometimes just dropping temp. Try to replicate the issue and keep a close eye on it, see if you can catch where it's failing real time.

 

[m_c]

Some PETG likes even higher temps, plus it generally doesn't like high print speeds
I've managed to create perfect looking prints in PETG, but they've delaminated with minimal effort, with the fix being to up the temperature 10degC.

However having looked again on a full size screen, I wonder if the temp is a bit too high, and the PETG is being burned?
The bad print areas are all where there would be a gap/pause in the extrusion, so it could be the PETG is overheating during the pause, then taking a little bit for the nozzle to clear to good PETG again.

I think I'd start diagnosing the issue with printing a temp tower.