20000 mAh Powerbank

prusaprinters

<p><strong>ATTENTION: Strictly avoid short circuit and wrong polarity !!!</strong></p><h5>Part list:</h5><ul><li>DIY powerbank modul 2.4A (e.g. from ebay)</li><li>4 Samsung INR21700-50E (21700, 5000 mAh)</li><li>4 hex screws M3 x 6</li><li>4 insert nuts M3 x D4 x L5</li><li>1 m flexible cable 0,75 - 1 mm²</li><li>2 mm foam rubber</li></ul><h5>Printing parameters:</h5><ul><li>Resolution 0.2 mm</li><li>2 Perimeters</li><li>20% Infill</li><li>Supports</li></ul><h5>Assembly:</h5><ol><li>Print all parts</li><li>Check fitting of knob</li><li>Check fitting of modul</li><li>Check fitting of holder</li><li>Check fitting of akkus</li><li>Insert nuts with solder iron</li><li>Plane contact surfaces of case and lid with sand paper (600, wet)</li><li>Connect all negative akku poles with 11 cm cable (see circuit plan)</li><li>Connect all positive akku poles with 11 cm cable</li><li>Solder cables to modul (13 cm positive cable, 21 cm negative cable)</li><li>Insert knob, modul and holder&nbsp;</li><li>Solder negative cable to akkupack</li><li>Pull negative cable loop and positive cable with a hook through center hole</li><li>Insert akkupack</li><li>Solder positive cable to akkupack</li><li>Add some 30 x 30 mm foam rubber pads</li><li>Close lid with four screws</li></ol><p><strong>Have fun !!!</strong></p><p><strong>Updates:</strong></p><ul><li>2022-02-04: Greater hole for iPhone plug</li><li>2022-02-10: Optimized PCB holder</li></ul><p>&nbsp;</p>