Simple 80mm fan grille

thingiverse

This is a remarkably straightforward fan grille that leverages some sophisticated features of Slic3r to utilize the infill pattern as a functional component of the print. The downloadable STL's won't be sufficient to replicate the print, but unfortunately there's no option in Slic3r to export the arrangement used as a project*. See the "how I designed this" section for more details on how it was accomplished. (*) Slic3r does allow exporting the whole plate as an AMF file, which will store the modifier and its options as metadata. I've added the exported file to the collection. Kudos to Xoan for his help in the comments section; using Slic3r can sometimes be less than intuitive. How I Designed This The OpenSCAD file includes geometry to create two distinct volumes. These can be exported as two STL's by prefixing each with an exclamation mark before rendering and exporting. To replicate the one that was printed, you need to first import the "main" stl, then select it in Slic3r using the right button and choose "Settings" from the context menu. This will open an advanced section where you can load the "modifier" stl, and once that's selected, you can add the following modifications: top perimeters=0, bottom perimeters=0, infill pattern=honeycomb, infill %=12. The size of the infill pattern is heavily dependent on both infill density and extrusion width, so this value will vary greatly depending on your printer's capabilities. Other infill patterns and densities also work well; this is primarily an experiment and/or tutorial for applications of the modifier options.