show layer number and height but wrong  

RE: show layer number and height but wrong

I dont think slicer uses the square brackets does it ?  I thought it used "{}" rather than "[]" ?

Isn't the issue that for computers the numbering starts at zero but for us flesh bags we start at 1 ?
Anyway if the count is out by one why not add that to your gcode ?
{layer_z+1} ?

RE: show layer number and height but wrong

It's a jumble. If you just want a fixed value, you use the square brackets:

M140 S[first_layer_bed_temperature] ; set target bed temp

If you're doing any sort of comparison in the slicer logic, you use the curly braces:

M140 S{max(first_layer_bed_temperature[0],75)} ; set bed PINDA warmup temp

Slic3r/PrusaSlicer is a bit ugly that way.

OP needs to be aware that [layer_num] and [layer_z] are not the same thing. [layer_z] is the current height of the nozzle in mm. [layer_num] is the layer currently being printed. Not sure if that's the issue, but mixing them up will definitely yield unexpected results. Not that I ever did this, mind you.

RE: show layer number and height but wrong

I want to thank both of you for the kind answers, but I did not understand if there is a solution.
For layers I can do [layer_z+1] but for heights how could I do?

The system works (I have screen readings) but there is this anomaly that I don't understand. Anyone else di this in any way ? is useful sometimes...

RE: show layer number and height but wrong

Posted by: @marco-tonoli

Hi all, i use this command:
M117 LAYER [layer_num] Z [layer_z]

in "After layer change gcode"  in printer setting -> custom gcode 

and it work but print wrong layer, it print the layer before. 
How i can have layer and height at display in real time ?

thanks

Have you tried putting your M117 message in the "Before layer change G-code"? That is usually where I put my layer dependent code (pauses for inserting objects, temperature towers, etc).

RE: show layer number and height but wrong

no. in my mind is wrong but i'll try.

RE: show layer number and height but wrong

Posted by: @marco-tonoli

[...] For layers I can do [layer_z+1] but for heights how could I do?

Just remember that layer heights are going to be the number of printed layers * (layer height -1)  plus your 1st layer height. Be sure to use >= or <= in comparisons unless you're certain the current layer height will match exactly.

RE: show layer number and height but wrong

not true, layer height is not layer*(layer height), i don't need this info because wrong. Layer height depend from previous layer which can be differente height, 1st layer is different also support layer are different.  I like to have REAL layer height and is not so difficult (first line on each layer tell it) but not find a good way to have. In cura is very simple to have .

RE: show layer number and height but wrong

i think to have found the issue: the preview did not calculate the use the z-offset value, my bed is a little (-0.25) offset but is in plane so i did not change it for now and use the z-offset value, but the preview di non calculate it so i have different value from preview to real world...