This paper model is a Ragnarok Mk-I Tank, a heavy main battle tank of the Imperial Guard that is mostly used by the Guard's siege regiments or when there are no Leman Russ battle tanks available, from the Warhammer 40K series, the papercraft is created by [unknown], and the scale is in 1:60. There are other three Ragnarok paper tanks on the site: Ragnarok Tank Paper Model Ver.1, Ver.2 and Ragnarok Vostorian Tank Papercraft.
The Ragnarok, much like the Siegfried light tank, was first developed by the regiments of the Death Korps of Krieg during the 500-year-long civil war that consumed Krieg out of necessity. The Ragnarok was the largest and most impressive of the vehicles designed during that conflict and was intended to replace the many Leman Russ tanks that were lost by the Loyalist Krieg forces during their battle against the Traitors.
As the civil war on Krieg ground on and the forces on both sides were drawn into a bloody stalemate marked by bloody attrition, it became clear that the only way to win was through the possession of superior numbers. The Ragnarok was designed not to be fast but to be able to cross the deadly terrain of no-mans-land and reach the enemy's lines. It was never intended to be used for long-range combat due to the pollution-choked atmosphere of Krieg limiting visibility, but to be easily and quickly built. The Ragnarok's ease of construction allowed the Loyalists to build so many so quickly that they could crush the enemy with their sheer weight of numbers.
The result of this slapdash process was an ugly, slab-sided vehicle that performed above expectations and was a major factor in the Loyalist forces winning the war for Krieg. As a testament to its solid design and other redeeming qualities, the Ragnarok has been completely restored to service by the Siegemasters of Baran, who still use it to this day and affectionately call it the "Mark 1 Mobile Bunker". [Source: wikia]
You can download the paper craft model here: Warhammer 40K - Ragnarok Mk-I Tank Free Paper Model Download [Box] [Gavitex]