Weird patten on bottom layer

[Kornsteven 0]

Hello,

This is my first post please forgive me for any lack of knowledge I'm still learning,

 

I've had my ender 3 neo for about a month and all my prints have been perfect, until last night, 

I used a raft for my prints and and seen a pattern on my layers that seems to miss a line or the line is not uniform to the rest of the raft, I have provided a photo of this, I have also noticed a change in pitch in the sound of the printer when it goes to that area, I have leveled bed over and over to make sure it's correct I have also checked the wheels on the bed and other axis these seem ok, but it has been printing fine up to now

 

Any help would be appreciated 

[Slashee_the_Cow 270]

If you try printing a file which has printed fine before and has a problem now, it's almost certainly something about the printer.

 

Make sure your belts are tensioned correctly and that the wheels on the Z-axis gantry are at the proper tightness (you should be able to put a couple of fingers on them and make them move back and forth a little, but not too much).

 

If the noise changes when it starts doing that second layer it could be something to do with not being able to move that gantry, although that doesn't explain the off lines on the bottom.

 

Worst case scenario: the motherboards in these things don't have a brilliant reputation for working as normal (or at all) for the reasonable life of a printer.

 

Also, these days, you usually don't need to use rafts: they harken back to the days when bed adhesion was a lot more of a problem (because half the time you didn't have a heated bed) so you did something big and solid which would much more easily adhere to the bed, then print your model which will easily adhere to the raft. But these days it's a lot easier to get things to adhere to the bed so they don't really need much help in that regard (or if they do, a brim should suffice).

[Kornsteven 0]

Thank you for your reply and help, I went ahead and printed a previous model and moved it over the same area as where the problem was, and so far it is printing completely fine, so there must be something up with the print I was trying before hand that's not showing in slicer that my printer don't like, strange one

[Slashee_the_Cow 270]

If you could share the Cura project file (.3mf, get it ready to print then go to File > Save Project) and the gcode file for the failed print we (and by "we' I mean us boffins who frequent the forums) could have a look and see if there's anything looks amiss.