Summary

Prusa Slicer was showing missing geometry after running Slice. I opened the file in Blender and ran the Make Manifold operation which resolved the issue.

This is just the fixed parts. You will need the remaining 3 files from the original by MakerSheen to complete the stand: https://www.thingiverse.com/thing:3326982

Print Settings

Printer Brand:

ELEGOO

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>ELEGOO NEPTUNE 3 Pro</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>15</p></div></p>                                                    <strong>Filament:</strong> Elegoo PLA

Laptop Stand - fixed Manifold