Thanks :), it is a prototype model for glue dosing made in TinkerCad ;).
I dunno why you can not open the project, maybe because it was created on macOS, I'm sorry didn't tell you. That's the reason why I use Cura slicer- my machine is Ender 3 Pro and Creality's slicer is not available for me...
last screenshot bothers me... It looks different on my PC but I use almost full infill with 6 walls.
I remember i had similar issue with one model taken from thingiverse but I forgot which one... This one i have change a lil bit and now it seems to be ok.