the file attached can be made into a boolunion in Rhino 5.
But no chance in Rhino 7 or 8 (error text dot in R7 says “Intersection curve ends at a non-manifold edge.”, R8 text dot doesn’t say anything except “!”)
the volumes come from GH via box array node.
looks like a regression to me. What is causing this?
and also for pointing out the “secondary text”, I can see it now
ps. I could make it work by scaling all the voxel a tiny bit up, so they intersect. However a rubust solution that can deal with such touching edges would be very welcome.