Z Fade Out

Hi,
I have a home built 3D printer, which is working ok.
It uses Marlin 2.0.x bugfix, and mega2560.
The question i have is regarding bed levelling.
I have auto bed levelling installed and working, and have the s/w set : #define ENABLE_LEVELING_FADE_HEIGHT 3.
So, above 3mm it should move to a height and print that layer, then move to the next height and print the next layer etc with z staying constant whilst printing each layer ??
What seems to be happening is that my z is moving up and down with x and y movements on every layer.
Also, i was doing a print which i aborted (for other reasons), and after aborting, whenever i moved the x or y axis via the front panel, the z axis would move fractionally up/down (repeatably). I powered the printer off/on and this situation then stopped ie. move x or y and z did not move.
So something weird is going on???
It looks like the z fade height setting is being ignored ?

Edited 1 time(s). Last edit at 12/08/2020 10:42AM by Chips.

If you have bed leveling enabled, the Z axis will move up and down to compensate with X/Y movements. If you enable fade, the correction will be less and less until you hit the fade height, after which correction will be no longer applied.
You cannot specify

#define ENABLE_LEVELING_FADE_HEIGHT 3

ENABLE_LEVELING_FADE_HEIGHT is a toggle, either true or false. The actual fade height is set either by using

M420 Z10

or with the

#define DEFAULT_LEVELING_FADE_HEIGHT 10.0

line in Configuration.h

Hi,
Thanks for your comments.
Yes, i have " #define ENABLE_LEVELING_FADE_HEIGHT 3 " set in the config.
So after 3 mm in height, it should stop moving the Z axis due to bed leveling. Above 3mm, it should move to the layer height, and print the entire layer without further z movement.
But it does not appear to be the case.
There is no other reason why the Z axis would move whilst it is printing a layer is there ?
As mentioned above, when i aborted a print from the front panel, it would still move Z up and down depending on if i moved X or Y from the front panel. This happened until i power cycled the printer.

NO!

"ENABLE_LEVELING_FADE_HEIGHT is a toggle, either true or false"

setting "#define ENABLE_LEVELING_FADE_HEIGHT 3" is garbage and is interpreted as #define ENABLE_LEVELING_FADE_HEIGHT true

M420 Z10 or DEFAULT_LEVELING_FADE_HEIGHT set the height

If you want a fade height of 3 mm set #define DEFAULT_LEVELING_FADE_HEIGHT 3

Edited 3 time(s). Last edit at 12/13/2020 08:16PM by Dust.

Quote
Dust
NO!

"ENABLE_LEVELING_FADE_HEIGHT is a toggle, either true or false"

setting "#define ENABLE_LEVELING_FADE_HEIGHT 3" is garbage and is interpreted as #define ENABLE_LEVELING_FADE_HEIGHT true

M420 Z10 or DEFAULT_LEVELING_FADE_HEIGHT set the height

If you want a fade height of 3 mm set #define DEFAULT_LEVELING_FADE_HEIGHT 3

There is no "DEFAULT_LEVELING_FADE_HEIGHT" in the current Marlin, in either configuration.h or configuration_adv.h

In Configuration.h but is only in bugfix as yet

#if ANY(MESH_BED_LEVELING, AUTO_BED_LEVELING_BILINEAR, AUTO_BED_LEVELING_UBL)
  // Gradually reduce leveling correction until a set height is reached,
  // at which point movement will be level to the machine's XY plane.
  // The height can be set with M420 Z
  #define ENABLE_LEVELING_FADE_HEIGHT
  #if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
    #define DEFAULT_LEVELING_FADE_HEIGHT 10.0 // (mm) Default fade height.
  #endif

In older marlin you use G29 F3 Fade height. (UBL only! For others bed leveling systems use M420 Z)

Many thanks for all of your comments.
I see the confusion! I am using Marlin big fix 2.0.x, which only has "#define ENABLE_LEVELING_FADE_HEIGHT 3" in the congif.h.
I have searched my config file but do not see what is mentioned in the previous post.
So i guess the issue i am talking about was the original bug which was fixed ?
So i will need a later version / bugfix for Marlin, which will then show the fade settings as per previous post, and hopefully work as expected.
I see the latest is 2.0.7.2 - will i be able to port my config to the new version, or is it a manual entry situation ?
Which version should show the settings in config as per previous post ?
Thanks

Quote

#if ANY(MESH_BED_LEVELING, AUTO_BED_LEVELING_BILINEAR, AUTO_BED_LEVELING_UBL)
// Gradually reduce leveling correction until a set height is reached,
// at which point movement will be level to the machine's XY plane.
// The height can be set with M420 Z
#define ENABLE_LEVELING_FADE_HEIGHT
#if ENABLED(ENABLE_LEVELING_FADE_HEIGHT)
#define DEFAULT_LEVELING_FADE_HEIGHT 10.0 // (mm) Default fade height.
#endif

I have just loaded the latest Marlin version (2.0.7.2)
In the config.h file, i can define the "Enable_leveling_fade_height"
Cannot see anywhere in Config.h or config.adv.h to actually set the default value for fade height.
Thanks

"is only in bugfix" ie [github.com]

Thanks