Welcome! Log In Create A New Profile

Advanced

Weird auto levelling bug (uneven) on X axis

Posted by ansisl 
Weird auto levelling bug (uneven) on X axis
January 04, 2018 10:10AM
prusa i3, Marlin 1.8.3, inductive probe, heated alu bed

I have auto bed levelling set up. Recently I noticed that I can't get even first layer (you can see from image attached) - Z like jumps up at ~certain X position.
Hotend hits bed (depending on Z offset - ~-0.6 - -0.8) on X-min or prints to hight on X-max.

I tried:
- bilinear, linear, 3 point levelling
- turned bed upside down
- switched X rods left to right
- tilting bed on X axis

G29 produces:
0 1 2
0 +0.107 +0.215 +0.037
1 -0.263 -0.203 -0.388
2 -0.658 -0.580 -0.798

also
#define DEFAULT_MAX_ACCELERATION      { 3000, 3000, 100, 10000 }
..
#define DEFAULT_XJERK                 10.0
#define DEFAULT_YJERK                 10.0
#define DEFAULT_ZJERK                  0.3
#define DEFAULT_EJERK                  5.0

my entire Config.h gist https://goo.gl/h9fxDS

Motors don't skip; X angle against bed seems ok enough.

Please advise! Thx in advance

Edited 2 time(s). Last edit at 01/04/2018 10:15AM by ansisl.
Attachments:
open | download - IMG_7601.jpg (408.4 KB)
Re: Weird auto levelling bug (uneven) on X axis
January 04, 2018 10:52AM
My 3D Printers have leveling thumb screws for the corners to level with, does your 3d Printer have the same, or a way to add leveling thumbscrews.
If bolted solid could you place a wedge of some kind to raise the negative numbers to a positive number.

And I print many models with leveling number close to yours.
Re: Weird auto levelling bug (uneven) on X axis
January 04, 2018 11:02AM
thumbscrews are there, I use them just to eyeball bed level (hence autolevelling), I did try extra tilted bed - problem persists :/
Re: Weird auto levelling bug (uneven) on X axis
January 25, 2018 03:40AM
anyone any ideas ? :/
Re: Weird auto levelling bug (uneven) on X axis
March 13, 2018 10:03PM
Hello there,

I just wanted to let you know that I have the EXACT same problem. I know it is a hardware issue but not sure what exactly is causing it....Still looking for a solution!

Edited 1 time(s). Last edit at 03/13/2018 10:11PM by devilmostwanted.
Sorry, only registered users may post in this forum.

Click here to login