It's very much possible, with limitations. Attached is a custom posed figure pulled from Chivalry 3D Printed on a DLP Resin 3D Printer (at tiny scale). I did a tutorial on it years back but the polygon count of in game files is very low, games hide this with bump maps and textures. You can't easily print your 'custom character' from skyrim because all the armour and details are defined in game, but printing the .nif assets is easy enough. Here's the more recent fallout 4 tute, will work with skyrim.