Summary

I was given a Texas Instruments SR-40 calculator without the battery cover. I measured the calculator case and designed a cover in TinkerCAD. Since it turned out pretty good I decided to post it on Thingiverse.

Print Settings

Printer Brand:

Creality

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Ender 3</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>0.15 mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>80 %</p></div></p>                                                    <strong>Filament:</strong> MG Chemicals PLA                Blue

Post-Printing

You might need to do a little filing on the section that needed support and on the part that latches into the calculator.
I use a guitar pick to open the cover.

TI SR-40 battery cover