Summary

Back support for the 2 vacuum wands, and the extra hose of the Karcher WD3 premium.
I attached the print to the head of the vacuum with M3 nuts and bolt (see details on the 4th picture)

Print in PETG for better flexibility !
Use 4 to 5 perimeters for better strength.

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>.28</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>15%</p></div></p>                                                    <strong>Filament:</strong> Prusament PETG                Galaxy Black                    <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>You can add tabs at the end of the thin part of the model to avoid lifting</p></div>

Vacuum wand support - Karcher WD3 Premium