First layer issue  

RE: First layer issue

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.  

RE: First layer issue

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,

RE: First layer issue

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

RE: First layer issue

@cwbullet

And this is the top part of the same model 

RE: First layer issue

@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 ? 

RE: First layer issue

@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

RE: First layer issue

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,

RE: First layer issue

@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

RE: First layer issue

@diem

Thank you for your help 

RE: First layer issue

@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 .

RE: First layer issue

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.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/first-layer-petg-not-sticking-to-print-bed/#post-148960

RE: First layer issue

@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 .