I must've had some other settings on that wasn't allowing the bottom layer to change because I put all my settings back to recommended then I changed the top/bottom layers to 0 and it worked. Not sure why. In reference to the bottom layer not printing very well, short lines like the ones on the bottom of the model tend to pull up of the build plate. I use glue, slow down the first layer, increase extrusion temperature for first layer and I can't find anything that helps. Even a brim doesn't helps because the issue is when the nozzle travels after the short lines.
What material are you using, and what kind of surface are you printing on? Bed adhesion issues have a bunch of possible causes, and solving those will help all your future efforts.
I'm printing with PCTG and printing on a steel build plate with blue painter's tape on it with glue.
Concerning the height: What happens there is that the height of the layer(s) doesn't change the model, it only changes where the layer intersects the model. The (1st) layer is still reduced in height, but the next layer will start sooner.
Setting the number of top/bottom layers to 0 should have worked, and works if I try to reproduce it here. Also you expect there to be walls on the 0th/1st layer as wel, even if there is
Could yout attach the saved project (Save As, not Export) so we can see what's going on? Ypu might need to zip it to attach it here.
Alternatively, depending on what you mean by "don't print very well" (but are otherwise OK with the bottom skin being there) there are different things you could try. Do those lines not adhere well to the build plate (in which case you could try adhesion methods such as printing a brim or sticking glue to the buildplate) or is there something else going on?
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