[newintellectual]

Not to be too big of a critic, but ...

This, and other projects like it, are NOT "from scratch". It doesn't include little things such as a motor; wires; other electronics; the metal frame.

Until "consumer" 3D fabrication can do more serious fab than random weak structural plastic components, it will remain as a hobby. The industrial machines able to sinter metal into strong parts or using carbon fiber - those have serious practical utility. I'd be much more interested in a low cost, high precision metal sintering 3D printer than a project such as this.