Hi,
The perimeter line around is called skirt. You can configure it in Slicer and yes, I also think it serves the purposes of pre-testing adherence and other stuff.
Regarding the wiggliness, it might be (but i'm not sure) that the layer is too high. It should be a number slightly smaller than the nozzle size (mine is 0.3 and my layers are 0.25).
Happy printing!
The perimeter line around is called skirt. You can configure it in Slicer and yes, I also think it serves the purposes of pre-testing adherence and other stuff.
Regarding the wiggliness, it might be (but i'm not sure) that the layer is too high. It should be a number slightly smaller than the nozzle size (mine is 0.3 and my layers are 0.25).
Happy printing!