This is an enclosure for a 2-port USB fast charger.
Just print it without supports and screw the charger boards inside using m2 screws and nuts.

These fast charger boards are commonly available in this specific size, support many fast charging protocols, such as QC2.0, and QC3.0, and work with input voltages of up to 24V.

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4x m2 bolts
4x m2 nuts

Using m2 bolts and nuts you can stack 2 charger boards inside the enclosure.