Summary

2 holders to support buck converter to use with Raspberry Pi. Just mount it to 4040 extrusion, wire the buck converter to the main power supply and the micro USB to Raspberry Pi. It's done! You need no soldering and no multimeter.

I used this buck converter:

https://www.amazon.com/SMAKN®-Converter-Supply-Module-OUTPUT/dp/B00R5JL8WI/ref=sr_1_3?__mk_pt_BR=ÅMÅŽÕÑ&keywords=smakn®+dc%2Fdc+converter+12v%2F24v%2F36v%2F48v+step+down&qid=1570976906&sr=8-3

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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>No</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>20%</p></div></p>                                                    <strong>Filament:</strong> Vertex PLA                Black

Ender-3 buck converter holder (for Raspberry Pi)

Ender-3 buck converter holder (for Raspberry Pi)

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