Summary

Usual V-slot corner with extended screw holes, should give more stiffness
Still with V-slot rail for best guiding
Print it as set in STL bor best layer adhesion and layer cracking prevention

Print Settings

Printer:

Anet A8

                                            <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>0.4x0.2</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>30%</p></div></p>

D-Bot Extended V-Slot corner