I modified this PSU to take the writing off the case since I use the 5A version at 36v. I also removed the banana plugs from the back. Original files uploaded also with my mod.

Banana Plug : https://www.aliexpress.us/item/2255801038683251.html
Buck Boost convertor : https://www.aliexpress.us/item/3256806180672362.html
Note: this is the 5A version, 5-36v in, but remember it can only handle 5A max so if your input is 5V your limited to 25W (5x5) just be cautious as these modules like to overstate their ability always verify chip to know its limits.
some wire, i used some 22AWG silicon wire i have for other projects https://www.aliexpress.us/item/3256805264231583.html
solder and soldering iron
Barrel Plug and Port : https://www.aliexpress.us/item/3256803137701407.html
I used the 5.5x2.1 as this is just what i have laying around from other projects.
Any DC power source that is at least 5V and not over 36V. I used an old laptop charger that is 20V and up to 8A and have not had any issues yet.

Summary

There are a number of nice cases for the ZK-4KX DC-DC buck-boost converter module, though I found very difficult to make the connections inside the box and nearly impossible to introduce the unit into the case if the wires were previously connected. In this model, the connections are made before inserting the module into the box (the banana plug pair on the front is inserted after the power supply unit and then easily mounted before closing the rear cover).

Use the same case for ZK-4KX or ZX-5KX DC-DC units.

Lid depends on the module: ZX-5KX has a built-in fan, so you can choose MINI LID SWITCH.stl or MINI LID NO FAN.stl depending if you want or not a switch on the rear to turn the power on/off.

For ZX-4KX you can use the same covers, but if you plan to use high wattages it is convenient to install a 4010 mm fan on the rear lid (MINI LID ZK-4KX.stl or MINI LID NO SWITCH). In this case, I use the switch to connect or disconnect the fan.

The unit can easily be powered with a simple charger or with an old laptop charger for those applications that need more power.

Thanks to the original designer SRMN https://www.thingiverse.com/srmn/designs