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SteveAllen
(@steveallen)
Active Member
Weird layers alignment

Hello everybody, I hope someone can solve my problem, I really don’t know what to do.

I noticed that my prints started having misalignment on layers. I have a MK3, 5 years old and 300 days of printing time. 

I share a couple of photos

I tried changing flowrate, layer height, extrusion temp, speeds, number of walls, infill, even changed the X and Y belts with new ones, and obviously run Prusa calibrations, but nothing changed. 
I used different slicing softwares and different filaments. 

I believe it’s something related to the hardware, but really don’t know what…

Thanks in advance for your kind response 🙂

Steve

Posted : 28/01/2023 10:49 pm
Hello
(@hello)
Noble Member
RE: Weird layers alignment

please put photo of first layer cal

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Posted : 28/01/2023 10:52 pm
Hello
(@hello)
Noble Member
RE: Weird layers alignment

how long ago did you lube rods and please put photo of the hotend

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Posted : 28/01/2023 10:54 pm
Hello
(@hello)
Noble Member
RE: Weird layers alignment

oh sorry and also what is your belt tension at

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Posted : 28/01/2023 10:55 pm
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE:

I’ve done the belt tension test with the STL downloaded from Prusa and calibrated in the mid of Low-High for both belts. 
Lube the rods a month ago. 
These are the requested photos


Posted : 28/01/2023 11:10 pm
Diem
 Diem
(@diem)
Illustrious Member

No worse than your fan shroud...

You probably should attend to your first layer and at least clean your print-sheet but it's not causing this issue.

First, with the power off, move the axis by hand; is it smooth? Does the resistance stay the same over the whole range?

Check your smooth rods are not damaged/scratched. Check the idler pulleys are not clogged, out of line, or damaged (loosen the belt and try turning it with your fingertip, is it smooth?)

With the belt loose try turning the stepper motor by hand; is it smooth? - You should feel the steps but no grating.

Let us know how you get on.

Cheerio,

Posted : 28/01/2023 11:53 pm
Hello
(@hello)
Noble Member
RE: Weird layers alignment

Any crashes in statistics on printer 

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Posted : 29/01/2023 12:06 am
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

Which fan shroud do you suggest? 

Posted by: @diem

No worse than your fan shroud...

You probably should attend to your first layer and at least clean your print-sheet but it's not causing this issue.

First, with the power off, move the axis by hand; is it smooth? Does the resistance stay the same over the whole range?

Check your smooth rods are not damaged/scratched. Check the idler pulleys are not clogged, out of line, or damaged (loosen the belt and try turning it with your fingertip, is it smooth?)

With the belt loose try turning the stepper motor by hand; is it smooth? - You should feel the steps but no grating.

Let us know how you get on.

Cheerio,

 

Posted : 29/01/2023 9:40 am
Diem
 Diem
(@diem)
Illustrious Member

I noiced that your print fan shroud also shows poor layers - not a problem, it's still work ok.

Cheerio,

Posted : 29/01/2023 11:35 am
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

Posted : 29/01/2023 11:50 am
fuchsr
(@fuchsr)
Famed Member
RE: Weird layers alignment

One thing you didn't mention is whether you tested the grub screws on the X and Y motors. That was my first guess seeing your initial pictures. Tighten them and make sure that one of the two on each axle is tightened against the flat side of the motor axle. After 5 years there's a reasonable likelihood they worked themselves loose.

Posted : 29/01/2023 12:16 pm
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

Could you add some picture of what I have to check? I’m not English mother tongue and didn’t understand well what I have to control. 
thanks

Posted : 29/01/2023 5:42 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Weird layers alignment

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 : 29/01/2023 6:17 pm
fuchsr liked
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

All the screws are tightened and one is against the flat side. 
The smooth rods are in good condition. Sure not as new but good

Posted : 29/01/2023 7:06 pm
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE:

I’m thinking about this don’t-know-how-it’s-called, that lets the head move up and down on the Z axis… Maybe it’s ruined

This post was modified 1 year ago by SteveAllen
Posted : 29/01/2023 7:10 pm
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

This

Posted : 29/01/2023 7:16 pm
fuchsr
(@fuchsr)
Famed Member
RE: Weird layers alignment

This what?

Posted : 29/01/2023 7:55 pm
SteveAllen
(@steveallen)
Active Member
Topic starter answered:
RE: Weird layers alignment

Sorry I posted a photo of the Trapezoid nut I was talking about. Don’t you see it in my previous post? Maybe it’s ruined 

Posted : 29/01/2023 8:08 pm
fuchsr
(@fuchsr)
Famed Member
RE: Weird layers alignment

Trapezoid nut I was talking about

I don't see any prior mentioning of the trapezoid nut in your previous posts, so this picture was out of context. Again, I'd check the grub screws, which I mentioned before and Joan posted pictures of.

Posted : 29/01/2023 9:21 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Weird layers alignment

the POM nut on the lead screw?

(Black thingie)

 

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 : 29/01/2023 9:51 pm
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