I have used lots of these buck & boost converters in many projects. In case you are unaware, buck converters can lower a DC voltage and boost converters can raise a DC voltage. These small units commonly cost between $1 to $2 each on AliExpress.

One complaint I have with these is that the mounting holes are extremely small. It's possible to get a combination of plastic screws and standoffs to mount these. But that adds cost and actually takes a long time to install standoffs and everything.

So I set out to design a box that would completely enclose the converters. I left some vents on each side. There is a slot for the wires. The slot isn't actually tall enough, so I use diagonal cutters to clip off a piece of plastic each time to get enough clearance. The converter simply friction fits in place and then the lid is glued on. The lid has a hole for accessing the adjustment screw.

The mounting box has two mounting tabs, so you can just mount it using self tapping screws into whatever surface you would like.

There are a number of STL files created for different common converters. You can look at some of the files ending with the name _vars.scad if you want to adjust this project to fit another converter.

Each converter is prepared by soldering wires to the circuit board

Each converter friction fits into the case

Superglue is applied to the box, the lids are placed on, and weight is used to keep them in place while it dries

The finished product

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This work is available for download in the ZIP file format under the terms of the "Attribution-NonCommercial-ShareAlike 4.0 International" license.

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