Because I use or plan to use so many different tools with my MPCNC, I want to have the electrical connections be as easy as the quick release mount I’m using. To this end, I plan have two RJ45s mounted on the Z tower - one for the Z stepper and touch plate connections, and one for an extruder stepper, thermistor, and heatsink cooling fan. A third connector, which will probably be a 4 pin molex, will carry higher current to the hot end heater and cooling fan/laser.
To this end, I designed a mount that clips on to the Z motor mount and provides mounting points for those three connectors. It also has eight screw terminal points on the back, to provide even more versatility for connections. There are also lots of holes all over for cable routing using bundle ties.
Even if you don’t plan to quick-change your tools, you might find a use for something like this, so I put it up on thingiverse, http://www.thingiverse.com/thing:1273861.
This picture is of a prototype, but the design is the same. I’m just experimenting with the sizes for the keystone opening now.