We’ve seen lots of power supply projects that start with an ATX PC power supply. Why not? They are cheap and readily available. Generally, they perform well and have a good deal of possible output. [Maco2229’s] design, though, looks a lot different. First, it is in a handsome 3D-printed enclosure. But besides that, it uses a TFX power supply — the kind of supply made for very small PCs as you’d find in a point of sale terminal or a set-top box.
Like normal PC supplies, these are inexpensive and plentiful. Unlike a regular supply, though, they are long and skinny. A typical supply will be about 85x65x175mm, although the depth (175mm) will often be a little shorter. Compare this to a standard ATX supply at 150x86x140mm, although many are shorter in depth. Volume-wise, that’s nearly 967 cubic centimeters versus over 1,800. That allows the project to be more compact than a similar one based on ATX.
The project is nicely documented and has features including colorful meters and USB ports. An import buck converter module give you a lot of options on output voltage.
The original build had a top and bottom plate made from plywood, but the current design files have STL files for those parts, in case you prefer to print them. Be prepared for a long print though. [Maco2229] says that even though he prints between 100 and 120 millimeters per second, printing at 0.28 layer height took about 14 hours.