This is a remix of https://www.printables.com/model/155787-prusabox-enclosure-enlarged-buck-converter-box-wit. The changes made were to add a square hole at the back of the case to allow using an external charger for the Raspberry Pi. I had problems with buck converters and not enough voltage so decided to have dedicated power for the Raspberry PI 4B.
** Before putting in the USB Female to Female adapter, put in the square nut for the buck converter tie down as once the USB adapter is in place, you would have to put in the nut from the other side which is a long way to slide the nut.
Note: When I printed mine, the hole for the USB Female to Female adapter was extremely tight but I managed to slide it in, so didn't reprint. I changed to size of the hole slightly bigger but haven't tested it yet, so that is something to beware of.
The parts I used to be able to plug the USB-C plug from the official Raspberry PI 4B power source are:
https://www.amazon.ca/gp/product/B08SGNNX4L
The author remixed this model.