I have exported very, very fine detail from 3DCoat sculpted files printed with the Form 1 printer. Even at the scale of your object (which appears to be about 5 inches tall) you should easily be able to export at a resolution far higher than the Form 1 will physically resolve.
Try this: resample your voxel object up to about 8-10 million polygons. Convert from voxel to surface mode. Decimate by 75%-85% to reduce file size without affecting resolution much. Export as obj or stl without any reduction. Reduction during export can reduce resolution in an undesirable way. This should give you a very highly resolved object for printing.
setz's post in 3D Print quality ? was marked as the answer