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Mesh Bed Leveling

T

tamueic

New Member
#1
#1
Has anyone experimented with mesh bed leveling on their gMax?

I've noticed our glass heated bed is about 0.4mm lower in the middle than on the sides (crazy, I know...) and it makes it almost impossible to start a large print with any remotely small layer height. The last large print used 0.8mm layers (1.2mm nozzle) and it too became unstuck about an hour in. I could use a raft but that adds a few hours to the build and a lot of material usage.

There's a development branch of marlin that includes mesh bed leveling and I'm wondering if anyone's tried it. It seems like it'd be a real help with a large bed like this.

EDIT: I seem to be a bit out of date, looks like mesh leveling was adopted into Marlin Main as of 12 days ago (1.10 release).
 
gCreate_Joshua

gCreate_Joshua

Administrator
Staff member
#2
#2
We just added a custom version of the new marlin in our downloads section. It has the mesh bed leveling, and all I can say about that is AMAZING!!!
 
N

nopick

Member
#3
#3
gCreate_Joshua said:
We just added a custom version of the new marlin in our downloads section. It has the mesh bed leveling, and all I can say about that is AMAZING!!!
Click to expand...
FYI

On the download page you have:
You must use Marlin 1.8.2 to install...

Should be:
You must use Arduino 1.8.2 to install...
 
N

nopick

Member
#4
#4
If you have an older 1.5+ with the BL Touch mounted on the left side of the hotend, you will need to move it to the current location with a new bracket or modify the offset in configuration.h.

Here is an example of what worked for me. The newer values are commented out below the values I brought in from the older firmware.

//gMax Single E3D Hotend
#define X_PROBE_OFFSET_FROM_EXTRUDER -16
#define Y_PROBE_OFFSET_FROM_EXTRUDER -17
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.9

//#define X_PROBE_OFFSET_FROM_EXTRUDER 11 // X offset: -left +right [of the nozzle]
//#define Y_PROBE_OFFSET_FROM_EXTRUDER -23 // Y offset: -front +behind [the nozzle]
//#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.9 // Z offset: -below +above [the nozzle]
 
gCreate

gCreate

Administrator
Staff member
#5
#5
nopick said:
gCreate_Joshua said:
We just added a custom version of the new marlin in our downloads section. It has the mesh bed leveling, and all I can say about that is AMAZING!!!
Click to expand...
FYI

On the download page you have:
You must use Marlin 1.8.2 to install...

Should be:
You must use Arduino 1.8.2 to install...
Click to expand...

Thank you. Fixed it.
 
gCreate

gCreate

Administrator
Staff member
#6
#6
nopick said:
If you have an older 1.5+ with the BL Touch mounted on the left side of the hotend, you will need to move it to the current location with a new bracket or modify the offset in configuration.h.

Here is an example of what worked for me. The newer values are commented out below the values I brought in from the older firmware.

//gMax Single E3D Hotend
#define X_PROBE_OFFSET_FROM_EXTRUDER -16
#define Y_PROBE_OFFSET_FROM_EXTRUDER -17
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.9

//#define X_PROBE_OFFSET_FROM_EXTRUDER 11 // X offset: -left +right [of the nozzle]
//#define Y_PROBE_OFFSET_FROM_EXTRUDER -23 // Y offset: -front +behind [the nozzle]
//#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.9 // Z offset: -below +above [the nozzle]
Click to expand...
We have 3 configuration files in the zip file with different offsets. One for an E3D, J-Head and for Dual J-Heads. For the single J-head our values are close to yours. We only moved the bltouch to the right side when using an E3D because of the fan placement.

//gMax Single J-Head Hotend
#define X_PROBE_OFFSET_FROM_EXTRUDER -16 // X offset: -left +right [of the nozzle]
#define Y_PROBE_OFFSET_FROM_EXTRUDER -21 // Y offset: -front +behind [the nozzle]
#define Z_PROBE_OFFSET_FROM_EXTRUDER -1.9 // Z offset: -below +above [the nozzle]
 
N

nopick

Member
#7
#7
Ok. I installed the E3D V6 before you had the option so, my fan is on the left side of the hotend with the BL Touch in the original j head location. So, my offset edit would work for anyone with the same set up I have. They can load the single E3D configuration.h and make the offset adjustment.

This firmware dramatically improves first layer consistency. Thanks for providing it.
 
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