A customizable t-nut for OpenBuilds V-slot. This is designed for lighter-duty work and doesn't use a metal nut. The plastic hole can be tapped, or a screw can just be twisted into it. Can be customized for any size screw, and any number of nuts, but I've included STLs for a dozen M5 nuts and a dozen M3 (or 4-40) nuts. If you need more solid attachments, you can use my 10-32 T-nuts (which require small-profile metal nuts) here: http://www.thingiverse.com/thing:468601