NIH 3D
This is a two part square (50.8 mm^2) filter stand for the photonics lab at Michigan Tech. The square filter is placed into the slots on the top half of the mount which is then placed into the bottom half and held in place with a set screw. The hole is designed for a 1/4" set screw; a respective nut is to be press fit in. The lab has requested for a spot to place labels on the stand so a standard size label black was added to the top mount.
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NIH 3D
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This model is published by its creator on NIH 3D. STLFinder only indexes it: the "View on NIH 3D" button above opens the original page, where the creator shares the FCSTD, GLB, JPG, PNG, STL, WRL, X3D files under their own license.
This model is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
Yes, the creator shares it at no cost on NIH 3D. Some creators accept tips or donations.
Check the license (Public Domain) on the original NIH 3D page. Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer.