Meshlab can do this, if you don't have access to a linux machine and use
ctmconv red-rocks-smrf-only-delaunay.ply red-rocks-smrf-only-delaunay.ply
Meshlab seems great, may even be as useful as Blender.
On Windows 10, the default viewer.
I'm going to use the Creality Slicer (which is based off Cura). It doesn't quite fit.
This seems reasonable to print.
Will fire up the printer and see!