First time PETG print failed. Please help | 3D Printing | Page 1

lunar wigeon Dec 27, 2025, 10:43 PM

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Hello! So I'm trying PETG for the first time and decided a good test would be an overhang test with supports just to see how it handles all of that and it did NOT go well. Had to cancel it cause it didn't look good.

I'm thinking I had my nozzle temp too high maybe?
Nozzle temp: 250
Bed temp: 75

Attached is an image of the print after I canceled it.
The ring on the right was not supposed to be there. That came off of the support structure I believe

Please help 😭

silver echoBOT Dec 27, 2025, 10:43 PM

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lunar wigeon Hello! So I'm trying PETG for the first time and decided a good test would be an...

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AI Help

It sounds like you may be experiencing issues with temperature settings. PETG typically prints well at a nozzle temperature of around 240-250°C and a bed temperature of 70-80°C, so your temperatures seem appropriate.

The problem could be related to cooling or support settings. PETG doesn't handle overhangs and supports as well as some other materials, so you may need to adjust your support settings or consider using a cooling fan to improve the print quality.

Additionally, make sure your printer settings, such as printing speed and layer height, are optimized for PETG. It also helps to ensure your nozzle is clean and free from any clogs that may affect the extrusion.

If you continue to have issues, feel free to provide more details or reach out to the manufacturer of your printer for further assistance.

lunar wigeon Dec 27, 2025, 10:44 PM

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Also as a note I'm printing at 80% speed here

lunar wigeon Dec 27, 2025, 11:10 PM

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Update: tried lowering the temp to 230 and lowered the speed to 75% and it still failed

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And the layers on the support structure fell apart when I tried to remove it which leads me to believe it's a moisture issue maybe

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Any assistance would be helpful

solar vale Dec 28, 2025, 12:41 AM

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To try:

dry the filament
bed temp at 80 for pei
check minimum and maximum layer time are high enough. (In filament settings)
check volmetric flow rate under filament settings is correct for your machine.

lunar wigeon Dec 28, 2025, 12:43 AM

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I've already tried to bed dry the filament but I don't think it worked. I'ma invest in a dryer eventually so I'll try again then.
I'll also try the other stuff after this.
Thank you for the info!

lunar wigeon Dec 28, 2025, 1:51 AM

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@solar vale
Quick random question. How do I know if the min and mad layer times are right? Is it different per printer? And if so how do I find out the right values?

solar vale Dec 28, 2025, 1:56 AM

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lunar wigeon <@449142875494678528> Quick random question. How do I know if the min and mad l...

Yes different per printer, but if it's to low, the filament will appear melty, tree supports can bend up from the plate + fail.

This is what you can do if you're cooling is already at 100% speed.

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Print a small thing ( like only benchies chimneys) and adjust up in 5 secs til you get something not melty 👌

lunar wigeon Dec 28, 2025, 1:57 AM

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solar vale Yes different per printer, but if it's to low, the filament will appear melty, t...

By cooling do you mean the fan? Cause on my printer I have the ability to turn on an auxiliary fan or something and I turned it to 50% but there was no change

lunar wigeon Dec 28, 2025, 1:58 AM

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solar vale Print a small thing ( like only benchies chimneys) and adjust up in 5 secs til y...

I'm not entirely sure what you mean by this. Adjust what? And wdym in 5 secs?
Sorry I'm new to this

solar vale Dec 28, 2025, 1:59 AM

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lunar wigeon By cooling do you mean the fan? Cause on my printer I have the ability to turn o...

Yes, part cooling fan. Auxiliary fan is for venting enclosed printers, like a qidi q1 pro.

Printing has evolved so fast, dw.

solar vale Dec 28, 2025, 2:04 AM

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lunar wigeon I'm not entirely sure what you mean by this. Adjust what? And wdym in 5 secs? So...

https://www.thingiverse.com/thing:909901
Print this, but not for retraction.

Adjust the minimum part cooling and layer speed til you get it clean like the picture in 5 second intervals.

These are slicer settings that in orca you can find under the filament settings cooling tab. bulbasmile

Thingiverse

Retraction test by deltapenguin

(10/19/2016)I did retraction calibration for B'struder.Extruder drive: B’struderKysan Nema 17 5.18:1 geared stepper motor, 2.4 V, 1.0 Aconfig.g of RepRapFirmware-dc42 1.12aM92 411.230M201 X4000 Y4000 Z4000 E3000 ; Accelerations (mm/s^2)M203 X15000 Y15000 Z15000 E15000 ; Maximum speeds (mm/min)M906 X800 Y800 Z800 E800 ; Set motor currents (mA)M...

lunar wigeon Dec 28, 2025, 2:06 AM

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I don't understand how I change the settings mid print

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I'm very confused I'm sorry

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Part cooling part I understand

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By layer speed do you just mean the general print speed?

solar vale Dec 28, 2025, 2:07 AM

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lunar wigeon I don't understand how I change the settings mid print

Oh ok, my bad, new print with new settings each time

lunar wigeon Dec 28, 2025, 2:07 AM

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I see

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So start print, wait 5 seconds, adjust, repeat?

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Or do I print the whole thing and adjust after?

solar vale Dec 28, 2025, 2:09 AM

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Here maybe this might help a bit 😅

lunar wigeon Dec 28, 2025, 2:10 AM

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Okay and do I increment up or down? And what settings exactly

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Sorry for all the questions I just have no idea what I'm doing

solar vale Dec 28, 2025, 2:16 AM

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Generally up for layer time.

You can mouse over for tooltips.

The min layer time is "time below this number without max fan"
The max layer time is "time below this number with max fan, before slowing the print"

It gets really technical sometimes and there can be a fair bit to learn. By asking, your helping direct my attention so i can help you better. bulbasmile
Feel free to ask anything easy or not, and i'll try my best to answer.

lunar wigeon Dec 28, 2025, 2:18 AM

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Okay and you said to increment by 5 each time? And this is both of them together right?

solar vale Dec 28, 2025, 2:24 AM

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It's kinda a guess 😔
I dont yhink i'm doing the best job of explaining it.... 😅

Try here:
https://ellis3dp.com/Print-Tuning-Guide/articles/cooling_and_layer_times.html

Ellis’ Print Tuning Guide

Cooling and Layer Times

Ellis’ Print Tuning Guide

lunar wigeon Dec 28, 2025, 2:26 AM

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solar vale It's kinda a guess 😔 I dont yhink i'm doing the best job of explaining it.... ...

No you're fine I definitely have a better idea of what to do than I did before

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I'll do my research

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Thank you!

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I may ping you if I need more help if you don't mind me doing so

solar vale Dec 28, 2025, 2:27 AM

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Absoultwly! But sometimes i may take a while to respond 👌

(note: only for continuing chats usaully though)

silver echoBOT Dec 28, 2025, 4:27 AM

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lunar wigeon Dec 28, 2025, 6:29 PM

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@solar vale progress has been made!!

PXL_20251228_182830132.MACRO_FOCUS.MP.jpg

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It's messy but it worked!

silver echoBOT Dec 28, 2025, 8:32 PM

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#First time PETG print failed. Please help