Here's yet another Buck converter / voltage regulator case. The one I've got is a display type unit with only one set button.
The case is custom fit for this particular converter and comes in different tastes - whatever you like best: There are ventilated and plain versions, one uses 3x20 hex screws with a cylindrical head, the other needs 3x25 screws with a countersunk head.
If you want to attach the case to your printer frame using the extrusion slots, there is a frame mount stl which, when modeled into the case will mount the converter face up, either right or left. It is a separate file - if you want to use it just import both case and frame mount into your slicer, make sure all models will drop on to the build plate! If you want to alter the orientation of the mount, just turn it 180°. There is a one-layer flap protruding on one side, I had to model that into the frame mount to ensure it will stay in position when turned (otherwise the center would have shifted). There is a version of the base with slot mounts (4mm holes for T-nuts), depending on what extrusion you chose to mount it to the display may end up sideways, if that is what you want, there you are.
If you like what you see but need an adaptation, STEP files of all parts are available on Thingiverse (no .zip allowed here ... https://www.thingiverse.com/thing:5158164) for all your tinkering needs, enjoy.