I have a model with 5 main solid components. The cost to print is $91.86. I didn't need the components solid, so I hollowed them out leaving some spanning areas, probably removing around 25%-50% of the material. I uploaded it and now the hollowed version costs $96.48 to print! Any ideas how this happened? Both models look correct, I thought maybe there was an error with the solid model that wasn't properly counting a section, but everything looks fine.