Pocket Power Supply (USB PD Decoy with voltmeter)
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Matchbox size snap-fit box for a USB PD decoy board and voltmeter
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Having a cheap and small power supply for tinkering with electronics might be useful. For 5V you can always just cut a usb cable - but a USB C PD decoy board will give you a selection between 5V and 20V up to 3A.
Not all USB C power supply units will deliver the requested voltage, having a voltmeter helps to be sure.
Apart from the printed parts, you need a USB C PD decoy board (the one with mini DIP switches) a 0.28 inch voltmeter and a 200mil pluggable terminal block. All of the components are probably less then 5€ in sum.
Printed on a K2plus without supports in white Hyper PLA with 0.2 mm layer height, three walls and 15 % infill. I used scarf seams and enabled the overhang optimization. All of the precise [wall, z height] options were enabled. Takes about 25 minutes and 14g of filament on my printer.
PETG might even be better as the snap-fit features are rather thin.
After printing, start soldering the pluggable screw terminal to the decoy board (the top part of the box helps to align). Desolder the power or measurement wire of the voltmeter and bridge the contacts, put the voltmeter and the decoy board into the bottom part of the box and cut the wires to length. After soldering power/measurement and ground to the terminal on the board, just snap the two part together.
If you want to change the voltage (or forgot to set it), remove the pluggable part of the screw terminal - there is a cutout feature where you can gently use a screwdriver to separate the box.