The Rhm. Borsig Wäffenträger - one of the best tank destroyers.
This model is from the game World of Tanks (get the game here: www.worldoftanks.com)
Please be aware that because this tank has an open-topped cabin I recommend printing with a dissolvable filament as the support filament using a second extruder as to preserve the detail in the gun.
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Happy Printing!