turn smoothing off, everything thats not smooth will not be smooth printed out work real scale, and think of material thickness rhino has tools for mass measuring and checking if it will stand or not
I used to work for Offload Studios back when they up and some general tips I can point out for general 3d printing stuff is: No instanced geometry, it wont print. all normals facing the correct direction make sure all pieces have some amount of intersection otherwise it will fall apart/off , you can just simply go in and…