It didn’t turn out quite perfect. I think there are some errors in the model. First some pictures. 
Here it is, straight from the printer. I won’t name the printer since I don’t want to endorse the company behind it. I used regular PLA with 0.3 mm layer height and automatic support structures; quite coarse but I didn’t want to babysit the printer all day (it’s a shared makerspace 3D printer). As you can see there is a raft structure underneath the model which resulted in a prettier bottom side, but caused some problems with corners lifting from the bed.
Here you can see that the model sticks fairly well to the raft, only lifting a little bit. The raft itself however came apart during printing. It actually didn’t stick together very well from the start. When I print the other half I probably wont use a raft.
Now for the problems with the model I found.
Here I’ve put a power and a core module inside the case. Both the LED strip and relay connector are inserted fully but as you can see the locking clips on the relay connectors do not fully engage.
The design thickness of the enclosure walls is 1.6 mm. Mine turned out slightly thicker; about 1.65-1.7 mm. It consists of four parallel layers and no infill so the walls are not very strong.
With the connectors fully inserted (with the boards outside the case) I measured 1.7 mm between the power module board edge and the LED strip connector, so that one is fine. But between the board and the relay connector there is only 1.15 mm. An enclosure that allows the connector to be fully inserted would need to have walls that are thinner than that which would be very brittle. So for the next revision of the power module (or perhaps the upcoming quad relay module 
) I would recommend that the connectors are moved closer to the edge so that they stick out farther from the board.
Here is a view of the front with the modules inside. The DC jack is centered in the hole, but the other three connectors are about 1 mm too low. The relay and LED strip connectors can be inserted anyway, but not the USB connector. The distance between the center of the DC and USB connectors with the boards stacked slots is about 7.3 mm, but the distance between the centers of the two slots in the model is about 9 mm. In the STEP model the design distance between the two boards is 13 mm but the distance I measure between my boards is 10 mm.
A diagram of the dimensions I describe:
I fixed up my enclosure by mounting the power module on four washers, raising it by 0.5 mm. I also carved out a few layers from the USB slot. The result looks like this:
Now, I could try to correct these errors in the STEP file. But for reusability in other models it would be better to make these corrections in the source file (which hopefully is even drawn using constructive solid geometry). Would you please consider sharing these source files?
