Can you download the model, or is the only option to have someone print it for you?
BTW, that mech is not a Warhammer mech. If you're looking for Warhammer models, there are some available on line. Some are decent, some no so much, and then there are some that are super detailed, but cost quite a bit of money.
I for one, started by downloading some of those, but found I wanted to have more control of the details, poses, etc. so I started doing my own.
For the larger mecha I modeled my own based on the actual Warhammer model like the one above.
For the marines I got access to some low-res models extracted from games like WH40K:Space Marine. These models are fully rigged (posable), and look good because of detailed textures, but the actual geometry is pretty basic, so I first pose it like I want it, then export it as an STL, and use MeshMixer to smooth it and add details.
To print or, 3D print, that is the question...
SD3 printer w/too many mods, Printrbot Simple Maker Ed., FormLabs Form 1+
AnyCubic Photon, Shining 3D EinScan-S & Atlas 3D scanners...
...and too much time on my hands.