First layer issue  

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Lamita
(@lamita)
Active Member

Greetings

I am having inconsistent printing on my first layer, I am using Prusament PLA gentleman’s grey . Layer height 0.25 , solid layers bottom 3 . Printing filament setting to prusament PLA. See the attached image please .

I had the same issue with another prusament galaxy black filament ( with printing filament setting to prusa PLA .

Thanks for any help 

Best Answer by Ringarn67:

@lamita

I guess the picture from polymaker Matt filament is the top side? <--question mark

After watching some CSI series on tv I would say, without doubt, that these marks comes from fingerprint on your bed sheet (from your left hand) 😉 

So, as @diem and @cwbullet said, clean the bed sheet, thoroughly, with dish soap, more than once and Do Not Touch the printside afterwards

Posted : 11/06/2021 10:34 am
cwbullet
(@cwbullet)
Illustrious Member

Can you take some more pictures?  This may be too close.  Also, can you show the other side?

Your Z offset is off.  I think it might be too low, but I am having trouble being certain because of the photo. It could also be a dirty bed.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 11/06/2021 10:56 am
Diem
 Diem
(@diem)
Honorable Member

I had the same issue with another prusament galaxy black filament ( with printing filament setting to prusa PLA

If you are using Prusament use Prusament settings...

@cwbullet is right.  Your first layer Z is suspect and those spots of poor adhesion look very like fingerprints.  Clean the sheet with dishwashing detergent (Dawn/Fairy) and plenty of HOT water, rinse well and dry with a fresh paper towel. Handle by the edges only.

Cheerio,

Posted : 11/06/2021 4:30 pm
Lamita
(@lamita)
Active Member

@cwbullet thank you for your help , this is another picture of the print ( the bottom side ) 

 

Posted : 12/06/2021 1:38 pm
Lamita
(@lamita)
Active Member

@cwbullet

And this is the top part of the same model 

Posted : 12/06/2021 1:39 pm
Lamita
(@lamita)
Active Member

@cwbullet

And here is a print printed with poly maker Matt filament (printed with Prusa PLA settings) less problem .. I don’t know if it’s a setting problem or what ? 

Posted : 12/06/2021 1:45 pm
Lamita
(@lamita)
Active Member

@diem

Thank you for your reply.. I use prusament setting but when the problem happened I tried to print in prusa PLA setting . Regarding the cleaning, I clean it constantly with isopropyl alcohol spray ( I have the smooth sheet ) but I will try you way of cleaning . 

regarding my Z offset, do you think it is too close or too far from the printing plate ?

 

thank you

Posted : 12/06/2021 1:51 pm
Ringarn67
(@ringarn67)
Estimable Member

@lamita

I guess the picture from polymaker Matt filament is the top side? <--question mark

After watching some CSI series on tv I would say, without doubt, that these marks comes from fingerprint on your bed sheet (from your left hand) 😉 

So, as @diem and @cwbullet said, clean the bed sheet, thoroughly, with dish soap, more than once and Do Not Touch the printside afterwards

This post was modified 4 days ago by Ringarn67
Prusa I3 MK3S+ (kit dec -20), Prusaslicer 2.3.1, Fusion 360, Windows 10...
Posted : 12/06/2021 2:01 pm
Diem
 Diem
(@diem)
Honorable Member

I clean it constantly with isopropyl alcohol spray

Isoprop is great for maintenance cleaning but once it's soiled you need to be thorough.

regarding my Z offset, do you think it is too close or too far from the printing plate ?

It's close but you can go lower - more squished.

Cheerio,

 

Posted : 14/06/2021 2:31 am
Lamita liked
Lamita
(@lamita)
Active Member

@ringarn67

The polymaker matt picture was from the bottom side , I attached a picture for the top side of the same print .

regarding the finger print issue I felt so scared lol 😂😂 I clean my smooth sheet after each print with isopropyl alcohol but it could be due to my finger prints, I will clean my sheet with soap & reprint the same model and see . But why the polymaker print had very minimal issue when I am using the same cleaning techniques? Is it due to the filament itself or the heat ?

Thank you for you help

 
Posted : 14/06/2021 10:13 am
Ringarn67 liked
Lamita
(@lamita)
Active Member

@diem

Thank you for your help 

Posted : 14/06/2021 10:16 am
Lamita
(@lamita)
Active Member

@ringarn67

Confirmed , it’s a not so clean bed sheet issue. And I guess these were my left hand fingerprints 🤦🏻‍♀️😂 

I used a brand new printing sheet and the results were wonderful . I printed the same model ( and stopped after printing 20% ) because I just wanted to check the bottom part .

Posted : 14/06/2021 11:12 am
Ringarn67
(@ringarn67)
Estimable Member
Posted by: @lamita

@ringarn67

regarding the finger print issue I felt so scared lol 😂😂 I clean my smooth sheet after each print with isopropyl alcohol but it could be due to my finger prints, I will clean my sheet with soap & reprint the same model and see . But why the polymaker print had very minimal issue when I am using the same cleaning techniques? Is it due to the filament itself or the heat ?

Thank you for you help

Just a guess, could you have used both sides? Polymaker print on one side and the black "fingerprint part" on the other?
Other than that I have no idea why the polymaker print went well, (nice print btw)
What I do know is that the bed must be VERY clean! Soap and Water clean!!

This is, IMO, a good explanation of different cleaning techniques! When, why and how 
https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/first-layer-petg-not-sticking-to-print-bed/#post-148960

Prusa I3 MK3S+ (kit dec -20), Prusaslicer 2.3.1, Fusion 360, Windows 10...
Posted : 15/06/2021 5:51 am
Lamita
(@lamita)
Active Member

@ringarn67

Here is an image having the three filaments I usually use. I tired to position them on the same angle so the reflections will be the same .

Thank you for the links & your help , I really appreciate it .

Posted : 15/06/2021 10:37 am
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