From pfvlair.com via DIY Drones:

As the 3D printing technology stepped up recently I decided to create a new frame by it.

The idea came from my friend Adrian who has a 3D delta printer of his own design. After he showed me his first 170-sized race model, I was sure I wanted to have it.

However, slightly modified to fit all my electronics in it, respectively. Plus, I asked him to redesign the project so it supports night flying.