Sorry, I needed to finish fast the models so i just turned off the retract while combing plugin, it solved that problem.
@ignatius im printing for more than a half year and I'm always using the Advanced print profile, i need alot of the paramteres.
@gr5 hmm i didnt knew that i need to set that up in cura. yes, i use the zetoff fan shroud. But the problem is not coliding with other models, the problem is: why is the head going to layer 1 before going to the next part (model)?
all-at-once gives me worse result because there are many parts and the distance between the farest ones is big and there is alot of oozing.
The problem was in the plugin, its still sometimes there, but mostly its doing correctly.
Thanks for the answers.