thingiverse
I came into possession of a bunch of little display squares of flooring stone when a flooring display showroom closed. Each one was about 75mm square and they were attached to display boards. Ripping them off the boards and printing out this holder makes a nifty coaster and conversation piece.
The model has an option for making holes in the bottom into which you can put rubber or cork to make little feet.
It's an OpenSCAD model so works with the customizer. You can set the overall coaster size, as well as the inset space for the stone. You can also optionally add four small circles on the bottom corners suitable for adding rubber or cork feet.
Instructions
I made mine with .15mm layer height in white on a MakerBot Replicator 2 printer.
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file 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, this model is available as a free download on thingiverse. Some creators accept tips or donations.
Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.