Let Me Guess..... Wet(ish) Filament - PETG Environment

[VmusicV]

Hi,
As you can see from the pics; I am having trouble getting some, but not all of my PETG parts to have a decent first layer.
I know you won’t believe it but I had the filament in a dryer for 13 hours.

I saw this post, which seems “a bit” similar, but not exactly the same issue - but there was no solution provided

Getting small blobs on my first layer

Since the last update, a lot of my prints have been failing. I notice that on my first layer I am getting extra filament or blobs that it is causing the second layer to hit the model and detach the print. I have try cleaning the nozzle and even chaining it for a new one. I have also reset it to factory and change from AMS to the external filament At this moment I ran out of ideas of how to fix this problem. I believe the issue is that the nozzle drops extra filament here and there and I have al…

Any other suggestions?

• First layer speed suggestions
• Room dehumidifier (should I get one, will it really help)
• Using Polymaker Lite PETG (cuz the Bu Labs PETG-HF is sold out still)
• Any other suggestions

Thanks!
AJ

[blchandl2]

Here are some things to check:

1. Clean your build plate with dish soap and warm water.
2. Perform a filament calibration for pressure advance and flow ratio.
3. Perform a printer self calibration.

[Olias]

Guess again. Dirty build plate.

It could be wet filament but that won’t reveal itself until you’ve had multiple layers. This is clearly a first layer adhesion issues. Until you have that part remedied, one cannot truly diagnose if the filament is wet.

Before you waste any more filament and time, do a first layer test.

Here are some threads that discuss this.

Washing your plate is important!

Here’s my contribution to this stone soup. Since I’ve used these photos in so many other posts, why not make use of them here? What I can add to this is my favorite mantra "If I had a dollar for every time someone posted… 'I swear I cleaned the plate with {fill_in_solvent_used} and scrubbed it {fill_in_damaging_cleaning_pad_used}" I’d be rich!!! €:euro: If you think your plate is clean, try these tests. Which one of these do we think is clean? The one on the left, or the on…

P1s first layer note consistent

Welcome to the community. Well, the good news is that this is not a build plate adhesion issue. That would show blotches. Instead, this looks like a under extruded filament profile. Try two things, Calibrate the filament and/or increase the flow ratio. [image] This is what dirty build plate first layer test looks like. These fingerprints were deliberate in order to show the affect of a dirty plate. [IMG_20240407_181947693] [IMG_20240407_170849919] [IMG_20240407_173452814]

[VmusicV]

Thank you, thank you, thank you!!!
I will clean the build plate and retry.

You just saved me $150 on a room dehumidifier

[VmusicV]

Does the Bambu slicer software have a function (menu option or something) to perform a calibration?? I always, when I print anything, include the bed leveling option.

[EnoTheThracian]

@VmusicV

You just saved me $150 on a room dehumidifier

This would not really help either. Filament, especially PETG, is best considered wet on arrival. Those bags they come in do slow down, but do not stop moisture ingress. After an extended sea journey…

So a $60,- filament drier, a bunch of vacuum bags and some dessiccant satchels (ideally those you can dry in a microwave) are a good, affordable investment when printing PETG.
After getting a big bottle of dishwashing liquid, dishwashing brushes and maybe some gloves for the plates

[blchandl2]

Yes. On the Device Tab in the upper right you will find “Calibration”. This is to perform a machine calibration. It can also be started from the keypad on the machine under “settings”.

[VmusicV]

Ohhhh I have a Creality dryer. The thought was using a room dehumidifier in addition to the drying. Actually cleaning the build plate worked like a charm.

[VmusicV]

That did the trick. Cleaned the build plate with Dawn, and we’re up and printing.