Q: Can #NeoFinder catalog #STL files?
A: Yes, NeoFinder is able to get you a thumbnail of the 3D printer STL (Standard Tessellation Language) file, if you ask it to do so.
Open the DatabaseSettings and add ".stl" to the "Catalog QuickLook Thumbs for" list. Write the settings, and catalog a folder of STL files.
https://www.neofinder.de/forum/phpBB3/viewtopic.php?p=241
Enjoy!