RepRap 3D printer on the left (parent), and the RepRap 3D printer on the right (child) that it printed the parts for. Adrian Bowyer and Vik Olliver of the RepRap Project also in the picture. 14:00 hours UTC on 29 May 2008.
17 years ago today.
The first self-replication by a #RepRap #3Dprinter - the start of the #3Dprinting revolution.