Print Issue

Hello, I’m new to the 3d printing realm, i have encounter a problem I’m trying to print a model that has a 0.3 mm slit in the middle, but in my prints the slit is almost not existing, i have tried different layer heights. I now that the model isn’t the problem it has a lot of prints so its my fault

My printer is Ender 3 S1,(stock no modifications) PLA Filament, Cura Slicer

If anyone has an idea, it would help a lot. THX

Wow .3mm is not much considering if you’re printing at .2mm resolution. What is that part and why the gap? What is the orientation of the part on the print bed? Not sure I can help you figure it out as I’m a 3D printing noob too.