Simple case for a rather popular LTC3780-based board from Aliexpress e.g. this one: https://aliexpress.com/item/1005009222609081.html

It features a place for a 4cm fan in the lid, though you might need a separate power source to feed it, depending on which voltages you work with.

Printing:

• Better in PETG or other more heat-resistant materials

• The lid can be glued in or held by some tape