Summary

This thing was made with Tinkercad. Edit it online

https://www.tinkercad.com/things/10Qzd8vKN3q

You will need a little force to push it. Its not perfect but it works.
Made in Tinkercad, ill upload new version when I install some normal 3D modeling software.

ps. Print only wheel, other thing is bug :)

Print Settings

Printer Brand:

Wanhao

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Duplicator 6</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 mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>50%</p></div></p>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>ABS, think PLS would be better :)</p></div>

Whell for dc motor 3-6 v