RD DPH3205 buck/boost power supply case - banggood, alibaba

July 2020 update - Sorry no nice new one-piece Milwaukee M18 design yet so I have uploaded the "adaptor" that fits to the bottom of the box. I just used some thin rubber to cover the screw holes and prevent slipping on the desk.

Nov 2019 update - I've adapted this to run from a Milwaukee M18 battery pack. As the DPH3205 is a buck-boost, it can handle a variety of voltages as the pack is depleted however there is no protection circuit to protect the pack from low voltage. The Milwaukee adaptor prints as a separate unit to glue on however I will eventually generate a single printable unit.

Simple case for the power supply modules as found on alibaba and banggood here
It was designed for this module but the others in the series seem to be the same sizes.
Total dimensions of the box are 120 x 80 x 80mm. 4mm banana plugs are used for the input and output with an additional hole for an XT60 output plug.

The rear panel is a simple piece that clips into place so no screws required. It also contains a duct for the fan. Nothing is attached to the rear panel so it can all be assembled inside the main box then the cover clipped on the back.