[Help on fixing missing z layers]

@gr5 hello

Here is my project file.

Test_Cube.3mf

My previous guess about extra 0.3mm was wrong. I didn't notice next lines returning print nozzle after Z-Hopped retract:
G1 F3000 E1066.37277
G1 F120 Z10.7
;MESH:NONMESH
G0 F3600 X126.244 Y118.89 Z10.7
G0 X112.504 Y112.184
;TIME_ELAPSED:808.275368
;LAYER:51
;MESH:Test_Cube.stl
G0 X112.504 Y112.184 Z10.9
;TYPE:WALL-INNER
G1 F120 Z10.4

I made one more slice of TestCube with Cura and print it. And gap at the 50 layer is still here. You can see it at the attached photo.

[Help on fixing missing z layers]

Hi All.

Looks like I catch same issue.

I sliced (Cura 4.8.0) test cube and notice missed layer, then I printed another two copies from same g-code file and catch same missed layers on same height. Next I sliced test cube using another slicer software. And models are perfect. 

I start to check G-Code and found out:

I think it's software issue. Extra 0.3 mm per layer. It's a reason of horizontal gap. But I have no idea about root cause.