Based on the popular DPS5005 Module i have created a 3D printed power supply (Thingiverse STL).
These modules can also be controlled via usb with modbus. A python example is available on my github.
This allows for automatic measurements and live readouts.
A 32V old kodak power supply is fitted in the bottom of the case. For the fan a standard DC-DC buck converter was used.
The temperature stays reasonably cool when used with a fan while running at over 100W . The limiting factor here is the power supply and the 5A limit of the module. These modules should not be used without a bit of thought about airflow as the switchig mosfets can get very hot in enclosed spaces.