This is a small case for the DC-580 power supply.
Items you need (AliExpress links):
1 x DC-580 Constant Voltage Current Power Supply Module
2 x Banana Sockets
1 x Speaker Terminal
1 x USB-C 15/20V Trigger Module
5 x small screw e. g. M2.5x5
1 x wires
You can print this without supports, but I recommend using ≤0.16 mm layer height.