This is also my problem.
When I change filament color at a given layer and the nozzle goes back to continue the print, it produces a small defect at the start of the new layer. This is a problem if the new layer is for example a text, because the first character can be messed up.
Thus, I want to use also a small sacrificial object as the starting object at each layer in order to get the extrusion already stabilized on the main object.
It worked once, but then I found out it was by chance.
Is there some way of starting the new layers always from one specific object ?