Summary This is a filter holder for optical experiments. This component is part of the Open-source optics project, whose goal is to radically reduce the cost of scientific optical hardware: by the [Michigan Tech's Open Sustainability Technology Research Group]( http://www.mse.mtu.edu/MOST). For similar see the Open-Source Lab How to Build Your Own Hardware and Reduce Research Costs Instructions This open-source filter holder is designed to hold a standard filter on a smooth 8mm diameter rod. Flip stl to print. Use the OpenSCAD files to customize it for your application, print on your favorite open source 3-D printer and enjoy. Included are the main holder. For the thumb screw go to: http://www.thingiverse.com/thing:30500 If you need the base go to http://www.thingiverse.com/thing:28133 For an optical rail go to: http://www.thingiverse.com/thing:31370 Full information here: http://www.appropedia.org/Open-source_filter_holder This component is part of the Open-source Optics Library: Zhang C, Anzalone NC, Faria RP, Pearce JM (2013) Open-Source 3D-Printable Optics Equipment. PLoS ONE 8(3): e59840. This is part of a larger project to reduce the cost of scientific equipment using open-source hardware. Read more here