This project by newtonn2 is a nice DIY Small Bench Power Supply. I like the case design which is lettered with the toner transfer method. Great looking results.
“The heart of the unit is basically the same as on the other power supply. It is based on the LM2596S. This IC can handle up to 3A with a good heat sink. I would use it only for 2A to be on the safe side.”