This is a simple case for the "JacobsParts 48W Dual USB QC 3.0 Fast Charge Step-Down Buck Module Power 12V 24V DC Input". The case uses two modules stacked onto each other using standoffs. The standoffs work as power conduits between the two. You only need to solder one module to the barrel plug.
Print at 0.15mm layer height and 0.35mm layer width (important for letter fidelity). No supports.
Parts
The author marked this model as their own original creation.