The first layer prints the inner part but not the outer ring. The outer prints on the second layer which makes it not stick on the buildplate.
Tha model is errorfree and is cut on the bottom.
attach factoryfile.
Added the model as in the factory file, and one i moved the inner part a little bit "ballends_mod" (this slices as i want to print it).
Update:
i made another version a little bigger but still with the inner part offset a bit, this one
prints first layer with 1 inner and 1 outer perimeter but no infill between, but on the second layer it infills...
"ballends_mod1.factory"