I've watched Part 1. I like the infinity cube enclosure.
The most interesting [3D printing] video I've seen in the last day or two is this:
The first seven minutes is on printing calibration test pieces. Now I'm thinking if there's another round of plague money (in my country, sorry) I'll be getting a 3D printer. The must-have feature would be non-planar printing.
www.youtube.com/results?search_query=3D+print+nonplanar
edit: oil pan 4: Off by one minute. I wan't going to post this, but here you go:
How to 3D Print a Gun - Q&A And Information
If you can own a gun you can make a gun. To sell it you need an FFL.