Summary

This is drill case for "555 Metal Gear Motor" (which can be bought on Ebay for less than 10$). I have used a rectangular switch 13x19mm and DC In Line Plug Socket Female 2.5mm which has outer diameter 8mm.
Apart from print you will need:

555 Metal Gear Motor with drill chuck
Rectangular switch 13x19mm
DC In Line Plug Socket Female 8mm
Electrical wires

Print Settings

Printer:

HICTOP Prusa i3 clone

                                            <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>Doesn't Matter</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>                                                        <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>I've printed this using PLA so the settings depends on filament you are using. Form my current eSUN PLA(which I'm very disappointed) I was using 220C (230C first layer) and bed 65C(70 first layer). My beta case with round switch hole (which happened to be a design failure I've printed on 210C on different filament and results where far more superior even that filament was "no name")</p></div>

How I Designed This

Assembling instructions

            <div><p>What is important: make sure that you will solder wires the way that chuck will be spinning the right way as it is a drill so it crucial.<br>First do the wires.<br>Second screw motor to case.<br>Third Install drill chuck.<br>Push switch and DC socket into holes.<br>Glue the cap.</p></div>

small drill case