I’m seeing on swelling or bulge at the bottom of my printed parts. Do I have my z zero set too low?
Yes. Often called “Elephant Foot”, either too close for the first layer or over extrusion on the first layer. If you’re using the defaults in Lulzbot Cura, it comes set that way. Try lowering the first layer settings in advanced mode. And make sure the filament diameter is accurate.
I’ve found that in some cases, it can help to go to a slower profile, like medium or high detail. This gives the filament a little more time to cool before the next layer is slammed on top of it. Hope that helps!