We've finished the biggest print at the moment on our hand-made 3D printer named "REPLICADR" at our "CADR" hackerspace:
https://www.youtube.com/watch?v=0wvJ0-MaIrk
The printer was made by the "CADR" (https://cadrspace.ru/) members and I made some contributions to the project too. There were lots of challenges on the road to make it work but now the printer is capable of 22 hours printing non-stop.
Yet there is still some room for improvement, namely the cable management should be done properly.