Round 2 of the egg is currently printing. I've got the schematics in KiCad started and I am starting to breadboard the electronics. I am still waiting on various parts to arrive from Mouser but I should have a working demo of the stepper motor by the end of the week. Below are some progress shots.

Here is the breadboard setup. I'm waiting on a power supply I ordered on Ebay before I can fire up the stepper motor. Here I am using the DRV8825 breakout by Pololu to test out the motor driver chip. 

I continue to learn with each new 3D print. The threads need some work as they get damaged easily when threading the two halves together. The 20% in-fill is likely not helping. The side walls are still too thick at 7mm so I'll decrease by half again.