Failing prints

[th31nfamous 0]

Hi guys, i'm using an ender3v2, it's bone stock and since i have it i've burn probably like 10 roll of pla and it's been running flawless since day 1, now i'm having my first fails and don't know where to start.

 

Problem occur when there is retraction-extrusion, if it print a constant line, print is good. So i know my bed leveling is good because prints are ok when there is a constant line without retraction.

 

The picture i took is the start of the first layer from a plate with tons of 4mm holes and i printed this project already a dozen of time and it was flawless, same file, i didnt mod anything to the printer.. so i'm guessing something mechanical on the printed is good bad.. but i'm kinda lost and not sure where to start..

 

Last picture is the plate i printed in the past without defect like i'm having now.

 

Anyone have an idea of what would cause this?

 

 

 

 

Edited July 8, 2022 by th31nfamous

[GregValiant 1,251]

Looks like a bed adhesion problem.

Do you still have the stock plastic extruder?  The stock pressure arms are very prone to breaking (see the image below).  Take it off and look at the underside of the arm.  Under-extrusion can be mistaken for poor bed adhesion or a bad leveling job as all three cause insufficient squish to the build plate.

I can't see an ABL in the images...have you changed the way you are leveling?

Are you using anything to aid bed adhesion (glue-stick, hairspray, etc.)?

The bed looks clean.  Have you given it a good wipe down with isopropyl alcohol lately?

 

Here is the underside of a stock Ender 3 pressure arm.  Some were delivered like this.

 

 

 

[th31nfamous 0]

32 minutes ago, GregValiant said:

Looks like a bed adhesion problem.

Do you still have the stock plastic extruder?  The stock pressure arms are very prone to breaking (see the image below).  Take it off and look at the underside of the arm.  Under-extrusion can be mistaken for poor bed adhesion or a bad leveling job as all three cause insufficient squish to the build plate.

I can't see an ABL in the images...have you changed the way you are leveling?

Are you using anything to aid bed adhesion (glue-stick, hairspray, etc.)?

The bed looks clean.  Have you given it a good wipe down with isopropyl alcohol lately?

 

Here is the underside of a stock Ender 3 pressure arm.  Some were delivered like this.

 

 

 

 

Thanks for the reply!

 

Yes i still have the stock plastic extruder, i just did remove the arm and no crack found under it, and there's no abl installed, I manually level my bed.. i don't use glue stick or anything but i always wipe the bed with alcohol before each print... I understand that everything point to a bed adhesion problem.. but at the same time why would the wall that print constant (without retraction) get perfect adhesion?

 

I will try a test print with gluestick on the bed to see if it helps

 

 

[th31nfamous 0]

Just did a print and it  came out great since they are almost no retraction