Z-Offset only for the 1st layer

[fieldofview]

Z-Offset only for the 1st layer

[fieldOfView]

That would create a gap (weakness) between the first and the second layer. Here's a visualisation in ASCII art:

A:     B:     C:
---    ___    ---
---    ___    ---
---    ___    ---
---    ___    ___

A is the normal gcode. B is what the Z-Offset plugin does. C is what you propose. Notice the distance between the bottom layer and the first layer above that.

[cnaslain]

I understand what you mean. Thanks for the ASCII art.

Let imagine the initial Z offset is -3.00 with a layer height of 0.20. To squash the 1st layer so it has a better grip with the board, I shift the Z offset using baby stepping by a value of -0.10 to -3.10, then at the end of the 1st layer I shift the z offset from +0.10 to -3.00 to reset the level to the origin.

Such manipulation is ultimately what you describe in ASCII art, isn't it?

Is this nonsense in 3D printing? Maybe a bad workaround to try and fix a stickiness problem?

I did a small print test of a small cylinder with the original plugin gcode:

...
;LAYER_COUNT:5
;LAYER:0
M107
G0 F5400 X111.79 Y115.005 Z0.10 ;adjusted by z offset
G92 Z0.2 ;consider this the original z before offset
;TYPE:SKIRT
...
;MESH:NONMESH
G0 F300 X148.48 Y125.711 Z0.4
...
;LAYER:1
...

The I did another test with adding a G92 just before the layer 1 move:

...
;LAYER_COUNT:5
;LAYER:0
M107
G0 F5400 X111.79 Y115.005 Z0.10 ;adjusted by z offset
G92 Z0.2 ;consider this the original z before offset
;TYPE:SKIRT
...
;MESH:NONMESH
G92 Z0.0 ;Back to original z coordinates system before offset <------------ ADDED -----------
G0 F300 X148.48 Y125.711 Z0.4
...
;LAYER:1
...

With the original code, at the beginning of the 2nd layer, the nozzle is too low and scratches on the 1st.
Adding the G92 Z0.0 before the head movement of the 2nd layer, I find that the impression of the 2nd layer is better.
An explanation?