Summary

Same thing (https://www.thingiverse.com/thing:5426249) from ready4render, but to print it in two pieces to have a better finish inside the spool.

Just print this thing twice and connect them. It will be a tight fit and you don't need glue or anything. You still need supports to have a better finish on the outer side of the spool -you can try without but you won't get a nice result imo.

Print Settings

Printer Brand:

Creality

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Ender 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>Yes</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.2</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>30</p></div></p>                                                    <strong>Filament:</strong> Grilon3 PLA                Black

Cable spool / reel organizer