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The peculiarity of 3D printing is that the previous layer becomes the foundation for the next one. To obtain a quality model, it is necessary to correctly adjust the amount of extruded plastic.
If the substrate is too fragile, gaps will appear between the layers. When changing the nozzle from a large part to a smaller one, it is necessary to have a sufficiently strong foundation. There are a number of reasons that can lead to holes and gaps between layers. I think that you have something like that
Look, I also had this problem when printing on a project for Engre.co, and here are the main problems and solutions that I can advise you.
The menu of the Simplify3D slicer is used as an example. Menu items, their names, and locations in your software may vary.
You need to look at first if the solid top layers are not enough, either Infill percentage is too low, or Under-Extrusion.
Please read this article where you can find all information. https://www.simplify3d.com/support/print-quality-troubleshooting/gaps-in-top-layers/
In addition, I noticed in your photos that you have a stringing or oozing effect. I can also advise you to pay attention to the retraction distance, the retraction speed, it is also possible that your temperature is too high. The most common setting that combats this problem is usually called Retraction. If it is on, the extruder, having finished printing a certain area of the model, draws the filament into the nozzle, which is a good way to get rid of a stringing. Also, I find it right here: https://www.simplify3d.com/support/print-quality-troubleshooting/stringing-or-oozing/