Simply 3d print the front and the back panel, cut some 4mm plywood to size and source some components. All design files are available on github, ready for tinkering.
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You'll need the following parts to build the power supply. For those to be bought a link to AliExpress is included (I may get a comission if you use those). For the parts to be made yourself the required plans and file are linked.
The parts cost about 23 USD, the PCB (5 pieces) cost around 12 USD and the material costs of the front and back panel in PLA are around 3 USD. Thus your total costs would be around 40 USD, without the power supply.
Either you have one lying around from an old computer, or get an old one second hand. The wattage does not matter, even 200W are plenty. There are different form factors for PC Power supplies. Make sure to get an ATX power supply. Those have 150 mm width, 86 mm height, and typically 140 mm depth.
Also make sure to have 4 screws ready. They typically come with the power supply. If you need to buy some, the size is UTS #6-32, 6mm length should do fine but technically the length depends on the power supply.
Buy Screws on AliExpress
The ZK-4KX is a small DC-DC converter which can convert the input voltage both up and down. The output voltage and the output current limit can be freely adjusted. The converter is powered from the 12V rail of the ATX power supply.
| Output Voltage | 0.5-30V |
| Output Current | 0-4A |
You need at least a 24 pin connector (2x12 Pin, Molex Mini-Fit Jr.). Modern power supplies have multiple 12V rails. To use the maximum power capacity you need an additional 6 pin connector (2x3 pin, Molex Mini-Fit Jr.). Otherwise don't forget to close the solder jumper during asssembly.
Buy on Ali Express
Either order via a PCB manufacturer or make it yourself if you are into DIY PCBs.
Simply 3D-print the two provided STL files and you are good to go.
Front Panel STL Back Panel STL
Get some 4mm plywood according to the dimensions below. Some hardware store offer cutting services, otherwise just cut it yourself.
| 1x Top | 166x240mm |
| 2x Sides | 106x240mm |