Here a simple cylinder Copy rotate and axes rotated
before Boolean Union

After Boolean Union Fillets 1 unity are not possible in one pass! :(
but arc one by one yes! ;)


http://moiscript.weebly.com/uploads/3/9/3/8/3938813/cross_volume.3dm

Free Real time Render with Simlab Composer Light (max 1920*1080) (any format except nurbs 3dm from Moi : iges & stat are fine)
http://www.simlab-soft.com/3d-products/simlab-composer-freelicensee.php#lite