I purchased ser no 2 machine from Telion. I have assembled it and it works amazingly well. There were a few little problems with the instructions that have ben resolved quickly and efficiently by the company.The quality of the parts that were supplied is very high and they are really robust and manufactured to exacting tolerances. Parts fitted exactly into where they were supposed to without excessive force. I would recommend this 3D printer to any one that wanted a high quality robust printer.