KakiDIY built our own 3D printer.
It was a Micromake Kit which runs off an Arduino board on a Delta design. It took us 4 hours in the span of 2 days to assemble it due to some modification required as there are mismatched parts and we are dashing in and out for our meetings.
The printer is easy to build and it is value for money for a reliable yet portable one like this.
Here it is, enjoy!