Print and put together with an m3 nut and screw of your choosing. We originaly posted this as part of http://www.thingiverse.com/thing:26752 and the OpenSCAD code is there if you need it - but is easier to keep track of when using in other prints if it is alone.
Ideal for low profile m3x30/25mm.
Thanks to Nick for design.
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