Summary

Here is a perfectly functional dart.

Attention it must be printed 100% infill to respect the distribution of the weight
Attention it must be printed 100% infill to respect the distribution of the weight
Attention it must be printed 100% infill to respect the distribution of the weight
Attention it must be printed 100% infill to respect the distribution of the weight

https://youtu.be/TxVlH3mabJM

Print Settings

Printer Brand:

Ultimaker

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p><a rel="nofollow" href="https://ultimaker.com/" target="_blank">Ultimaker 2 Extended</a></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>0.2</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>100%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Attention it must be printed 100% infill to respect the distribution of the weight<br>Attention it must be printed 100% infill to respect the distribution of the weight<br>Attention it must be printed 100% infill to respect the distribution of the weight</p></div>

The Dart functional (video)