'm in the middle of a Micron+ build, and needed some of the 222 style Wago's in my build for the mains wiring. Since the Micron+ uses DIN rails, I assumed there would already be a model available. I was wrong, and here is mine. I used the Voron DIN mount as my inspiration for this design, though it is 100% my own CAD and model.
This is specific for the larger 222 style, which are generally what you will find with the generic Wago's available all over Amazon, and other sources. It is designed for the 413, 3 pin model, but it will absolutely hold the larger models; I have 5 conductor 415's, and they snap in just fine. The 2 conductor model, 412, does not fit, though you could Z scale the model down to 7mm thick, and the 412 would then fit.
Usage is get your wiring in order, and everything in place, then snap the Wago's down into the holder. You can get them out again by pulling from the bottom (opposite the connector levers) to pop it out of the retention clip. The DIN portion just snaps to standard DIN rails. I've printed mine in ASA and ABS+, and baring that I would think PETG would be a great material. Not sure I would recommend PLA, as it's more rigid.