Summary

I've made UselessBox by Grafalex, Remixed by Xrew and find out that there is no space for the spring in the false panel.
So I've made slightly change of the original one and added little hole for the spring or rubber band.
Then I found that two ~2cm rubber bands (used by kids to make bracelets) fited perfetly and easier that spring.

Print Settings

Printer Brand:

Wanhao

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Wanhao Duplicator i3 V2</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>Doesn't Matter</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>25%</p></div></p>                                                    <strong>Filament:</strong> FDplast PLA                Green

UselessBox false panel with spring hole