Sorry, I am new to 3d printing so don't know about printers but have you tried reducing the size of the STL file? You can retopologize/remesh the STL models to reduce the complexity (size) of the mesh. Meshlabs and Blender3d are two free programs capable of doing this.

Also, there are several programs that can convert grey scale height map images to geometry (STL or other format) which can then be used in 3d printers. Fusion 360 with Image2surface add-on as an example.