I remember a while back someone saying that these models were available for download. Sorry, I haven’t been able to find from where – any help? 
head here: https://projects.blender.org/blender/blender/issues/57683
bottom of first post is a link to the file “preview-cycles-5.blend”
you’ll have to enable visibility for any of the other objects besides the drip. 
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That’s them – thanks! 
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There’s some spots in the 4.0 Blender Manual using a material testball model that I don’t recall seeing in the 3.6 (or anywhere) – anybody here know the download link for it?
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it’s on google drive, link here:
was created by EntityDesigner (Jesus Sandoval)
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Downloading now, thx!