Bed mesh doesnt work well

Hello,
i own a tevo tarantula and recenitly i installed a proximity sensorand upgraded the firmware.
for some reason, the mesh leveling doesnt work.
its very easy to see that one corner of the print have the right distance between the nozzle and the bed, while another corner is not at the right distance.
the printer starts by homing all axis and then in mesure the bed in 9 different points.
im using cura, my start code is:
G28
G29
M107
M140 S60
M104 S210

z offset is -0.31

does anyone have an idea why it doesnt do a proper meshing?

Which Mesh Bed Leveling System are you using? The proximity probes are finicky. They don't always read accurately in all locations of the bed. Especially on a particular edge.

But with that said, you should be able to edit the mesh points that are 'wrong'.

Quote
Roxy
Which Mesh Bed Leveling System are you using? The proximity probes are finicky. They don't always read accurately in all locations of the bed. Especially on a particular edge.

But with that said, you should be able to edit the mesh points that are 'wrong'.

i dont understand what you mean

There are 5 sentences there. All are EASY to understand. And you won't even tell me which sentence you are having trouble with?

Quote
Roxy
There are 5 sentences there. All are EASY to understand. And you won't even tell me which sentence you are having trouble with?

what do you mean by saying bed leveling system? you mean the type of sensor?

There are five bed leveling systems supported by the Marlin firmware.

/**
* Choose one of the options below to enable G29 Bed Leveling. The parameters
* and behavior of G29 will change depending on your selection.
*
* If using a Probe for Z Homing, enable Z_SAFE_HOMING also!
*
* - AUTO_BED_LEVELING_3POINT
* Probe 3 arbitrary points on the bed (that aren't collinear)
* You specify the XY coordinates of all 3 points.
* The result is a single tilted plane. Best for a flat bed.
*
* - AUTO_BED_LEVELING_LINEAR
* Probe several points in a grid.
* You specify the rectangle and the density of sample points.
* The result is a single tilted plane. Best for a flat bed.
*
* - AUTO_BED_LEVELING_BILINEAR
* Probe several points in a grid.
* You specify the rectangle and the density of sample points.
* The result is a mesh, best for large or uneven beds.
*
* - AUTO_BED_LEVELING_UBL (Unified Bed Leveling)
* A comprehensive bed leveling system combining the features and benefits
* of other systems. UBL also includes integrated Mesh Generation, Mesh
* Validation and Mesh Editing systems. Currently, UBL is only checked out
* for Cartesian Printers. That said, it was primarily designed to correct
* poor quality Delta Printers. If you feel adventurous and have a Delta,
* please post an issue if something doesn't work correctly. Initially,
* you will need to set a reduced bed size so you have a rectangular area
* to test on.
*
* - MESH_BED_LEVELING
* Probe a grid manually
* The result is a mesh, suitable for large or uneven beds. (See BILINEAR.)
* For machines without a probe, Mesh Bed Leveling provides a method to perform
* leveling in steps so you can manually adjust the Z height at each grid-point.
* With an LCD controller the process is guided step-by-step.
*/
//#define AUTO_BED_LEVELING_3POINT
//#define AUTO_BED_LEVELING_LINEAR
//#define AUTO_BED_LEVELING_BILINEAR
//#define AUTO_BED_LEVELING_UBL
//#define MESH_BED_LEVELING

Quote
Roxy
There are five bed leveling systems supported by the Marlin firmware.

*/
//#define AUTO_BED_LEVELING_3POINT
//#define AUTO_BED_LEVELING_LINEAR
//#define AUTO_BED_LEVELING_BILINEAR
//#define AUTO_BED_LEVELING_UBL
//#define MESH_BED_LEVELING

im using bilinear

I have seen other threads talking about this when using Bi-Linear. And the person that wrote and supports the Bi-Linear Leveling is very busy right now.

Can you switch to another bed leveling scheme? If so... you should be able to avoid the issue until it gets fixed.

Here is a picture of the UBL Mesh Validation Pattern. That is used to edit and fine tune the mesh. [github.com]

Edited 1 time(s). Last edit at 10/09/2017 08:17PM by Roxy.