This paper model is a General Electric CF6-80C2, a variant of the General Electric CF6, which is a family of high-bypass turbofan engines produced by GE Aviation, the papercraft is created by PaperDesigners, and the scale is in 1:33.
For the CF6-80C2-A1, the fan diameter is increased to 93 in (2.36 m), with an airflow of 1750 lb/s (790 kg/s). Overall pressure ratio is 30.4, with a bypass ratio of 5.15. Static thrust is 59,000 lb (263 kN). An extra stage is added to the HP compressor, and a 5th to the LP turbine.
The CF6-80C2 is currently certified on eleven widebody aircraft models including the Boeing 747-400, and McDonnell Douglas MD-11. The CF6-80C2 is also certified for ETOPS-180 for the Airbus A300, Airbus A310, Boeing 767, and, as the F138-GE-100, the U.S. Air Force's C-5M Super Galaxy.
You can download this papercraft template here: General Electric CF6-80C2 Engine Free Paper Model Download [Box] [Gavitex] [Ge.tt]