This is the forth vehicle in the A.M.V.P. series of fictional armored vehicles. It is the A.M.V.P.(Armored, Multiple, Vehicle, Platform),Mk. IV, A1. This design got skipped when I published the others years ago. Now that I finally have a printer I am going back and reworking some of the older designs and adding some new ones as well. The Mk. IV is pretty much just like the Mk. III, but with a forth axle, and a slightly larger turret. No file for axles yet, I didn't have much luck printing them, brass or aluminum tubing seamed to work a lot better. 3/16th or 4.76mm diameter tube works well, 1 3/8in. or 3.5cm is the length. Some drilling and/or filling/sanding on the Hull Bottom where the axles go will definitely help it roll more freely. There are two Hull Tops, there is a Hull Top with cargo boxes, and one without, only one is needed for a complete model. The Hull Top with no boxes is better for smoothing out and painting, but it is a bit plan looking. The Hull Top is the only file that needs supports, everything else printed fine with out them. I used a brim on the Turret and the Hull Top, a brim or a raft on these parts will help prevent corners from pulling up. The file for the Guns was printed at a .10 quality setting. The guns barrels are pretty small and will benefit from a more precise setting. The clips that hold everything together could also be sanded a little, but I wouldn't overdo it, it really depends on what the resolution of the print is like. More Turrets, weapons, and accessories on the way, hopefully soon.