Summary This is an improved simple sample holder for peices of semiconductor wafers 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 sample holder is designed to hold a semiconductor wafer part on a smooth 8mm diameter rod. This is an improvement on the last version - as now you can change samples easily using tweezers and one hand only. It uses less plastic than v2 and has a cutout for samples that are short. Print on your favorite open source 3-D printer and enjoy. You can hold it to the smooth rod using m3s and the thumbscrew. Use the thumb screw from http://www.thingiverse.com/thing:30500 If you need the base go to http://www.thingiverse.com/thing:28133 Full information here Thanks to Chenlong for designs on 3D Studio Max. 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