3D printing exported model OBJ's

Can someone help me with a workflow that would allow me to 3D print a OBJ exported from DD?
I use Cura to slice. I tried Blender to add thickness and exported to Cura as an stl. but no good

Am I the only guy here that wants to 3D print a model?

no your not! i’ve been investigating the following for ages now, still havent worked out how to get a good system going. At the moment ive been using lots of autocad software to try and fill the mesh but its been unnsuccessfulso far.