Notifications
Clear all

First Layer uneven pattern  

  RSS
jay
 jay
(@jay-8)
Active Member
First Layer uneven pattern

I have read and followed the live z adjustment, over all of my print looks are all good. but the first layer just came out has some uneven patter like showing in the following video

https://forum.prusaprinters.org/wp-content/uploads/2021/08/uneven-pattern.mp4

my setup: Prusa MK3s+

filament: PLA+, (I have tried PETG, same result)

nozzle:0.4

prusaSlicer: 0.2mm quality 

 

 

This topic was modified 2 months ago 2 times by jay
Posted : 06/08/2021 3:48 am
jay
 jay
(@jay-8)
Active Member
Topic starter answered:
reply

note: I use 91% alcohol to wipe the sheet every time. 

Posted : 06/08/2021 3:56 am
JoanTabb
(@joantabb)
Moderator
Ripples

Hi Jay, 

that pattern happens when the Live Z is a little too low  (Too big a negative number)

I use 
'Life Adjust 'Z' My Way'

https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/

also, do you have your Mesh Bed levelling set to 7X7?
regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 06/08/2021 8:12 am
Brad liked
jay
 jay
(@jay-8)
Active Member
Topic starter answered:
bed leveling issue?

Hi, Joan, thanks for the reply,

I have done live Z my way method, and 7x7 mesh bed leveling was enabled before I took above video. Somehow the uneven part only happens on the right side of the bed. left side pattern looks good. is this related to my bed leveling? 

Posted by: @joantabb

Hi Jay, 

that pattern happens when the Live Z is a little too low  (Too big a negative number)

I use 
'Life Adjust 'Z' My Way'

https://forum.prusaprinters.org/forum/original-prusa-i3-mk3s-mk3-assembly-and-first-prints-troubleshooting/life-adjust-z-my-way/

also, do you have your Mesh Bed levelling set to 7X7?
regards Joan

 

Posted : 09/08/2021 1:59 am
JoanTabb
(@joantabb)
Moderator
Getting Edgy!

the picture looks like the side with ripples, the nozzle is too close to the build plate
have you made sure that the X axis is level? 
Use the LCD Knob to run the X axis all of the way to the top of the frame...  until BOTH ends of the X axis, stall against the Z axis top brackets.

You may need to run the X axis to the top, then press the X reset button, let the display settle to normal, and then try running the X axis to the top again!  to ensure that both sides stall against the top. 

then make sure there is nothing between the build plate and the heatbed, and that 

there is an extra change you can do if absolutely necessary...    Bed level compensation... but it's a last ditch effort..
once you have the centre printing well, you can adjust the sides, relative to the centre.  

beware it's easy to get confused...    

best of luck, 
Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 09/08/2021 10:07 am
jay
 jay
(@jay-8)
Active Member
Topic starter answered:
x-axis issue

Hi Joan, Thanks again for the reply, I suspect the X axis issue as well,

but as you send I need first move x Axis to the top and hitting the bracket, Please see attached picture, this is the highest I can go, +210 on the LCD knob, as you can see, it's not touching the bracket. is there anything I installed uncorrectly?

 

Posted by: @joantabb

the picture looks like the side with ripples, the nozzle is too close to the build plate
have you made sure that the X axis is level? 
Use the LCD Knob to run the X axis all of the way to the top of the frame...  until BOTH ends of the X axis, stall against the Z axis top brackets.

You may need to run the X axis to the top, then press the X reset button, let the display settle to normal, and then try running the X axis to the top again!  to ensure that both sides stall against the top. 

then make sure there is nothing between the build plate and the heatbed, and that 

there is an extra change you can do if absolutely necessary...    Bed level compensation... but it's a last ditch effort..
once you have the centre printing well, you can adjust the sides, relative to the centre.  

beware it's easy to get confused...    

best of luck, 
Joan

 

Posted : 12/08/2021 3:39 am
Ringarn67
(@ringarn67)
Reputable Member

Go up as high you can go, Z210.
Press "X" to reset machine
Go up again, now Z will stall against endstops

When machine is "homed" it knows where it is and stops at Z210

Prusa I3 MK3S+ (kit dec -20), PrusaSlicer, Fusion 360, Windows 10...
Posted : 12/08/2021 5:12 am
jay
 jay
(@jay-8)
Active Member
Topic starter answered:
fixed

Thanks Ringarn and Joan, the problem is fixed by resetting X axis.

 

Posted by: @ringarn67

Go up as high you can go, Z210.
Press "X" to reset machine
Go up again, now Z will stall against endstops

When machine is "homed" it knows where it is and stops at Z210

 

Posted : 12/08/2021 6:43 pm
Ringarn67 liked
Share: