And while we're at it, how about some #OpenSCAD thumbnails as well?
# ~/.local/share/thumbnailers/openscad.thumbnailer
[Thumbnailer Entry]
Exec=/bin/sh -c 'openscad -o %o --imgsize %s,%s %i'
MimeType=application/x-openscad
(btw clamp: https://www.printables.com/model/488423-customizable-table-plate-bracket-c-clamp)