Summary

I've experimented with lot of speakers mounts under my monitor and decided to design this simple one. It's easy to print with no need for support.
I've used those 3" full range speakers :
https://www.aliexpress.com/item/4000879399129.html
It can be easily resized to fit smaller or bigger speakers in Cura.

Print Settings

Printer Brand:

Creality

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Ender-3 v2</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 resolution"><strong>Resolution: </strong>                     <div><p>0.32</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>40%</p></div></p>                                                    <strong>Filament:</strong> Sunlu PLA                    <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>I've used 0.8 nozzle, 2 walls line count and 1.6mm wall thickness to print it faster. You can also use 0.4 with 0.2 reolution, But it'll take about twice the time.</p></div>

Universal 3" Simple speaker mount