This paper model is a SD Tiger I, the common name of a German heavy tank developed in 1942 and used in World War II. This papercraft is an original design from Break Even. The finished model is about 5.7 cm long. There are also two normal scale models available: WWII Tiger I Heavy Tank Free Paper Model and WWII Tiger I Heavy Tank Ver.2.
You can download the papercraft model here: WWII SD Tiger I Heavy Tank Free Paper Model Download