Summary

Based on Canon EF Body Cap design, here is an adapter to connect your Canon EOS DSLR to your telescope.
Openscad format.

Print Settings

Printer Brand:

Monoprice

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Select Mini</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>Yes</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>0.22</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>progressive</p></div></p>                                                    <strong>Filament:</strong> Don't matter PLA                Black (of course)

Post-Printing

Remove raft and supports.

How I Designed This

eyepiece section is up, Canon EF down.

Canon EF to 1.25 inch or 2 inch eyepiece