Loosing layers when saving

i make 3 layers black blue red when i try and save the what i am doing i loose the blue and red layers and the blue and red layers turn to black like the black layer
the 3 layers had different speed and power
my project layers ends up being all the same speed and power

How exactly are you saving?

Are you using the File->Save As or Save dialogue in LightBurn?

Additionally, make sure you didn’t use export/import. Those have a very different meaning and don’t retain layers.

i have loaded a file from the internet which has 3 tab when saving gcode in lightburn i then ended up with one file on my sd card which is a black tab

Can you upload the .lbrn file that contains your project and also the generated gcode? Add .txt to the end of the gcode or else the forum may not allow the upload.

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