At our last 3D Printer Club meeting, the kids on the team started cutting threaded rods. We were clamping the rods to a table with a standard bar clamp to keep them in place. The problem was that they were slipping a lot. One of the adults had to sit on the end of the rod to keep it still. That didn’t seem very safe to me, and so I figured there must a better and safer way to hold them still while they’re being cut. The classroom doesn’t have an appropriate vise to use, so this seemed like a great project for a custom 3d printed object!
I used OpenSCAD, which is a free and open source CAD software tool, to design a simple attachment. The attachment has a v-groove on the bottom to hold a rod in place. (The v-groove is useful because it allows us to use it for different diameters of rods.) It also has a lip around the top to hold it in place on the clamp jaw.
This clamping attachment is going to need to take a lot of pressure, so I printed it with ABS plastic, three perimeters, three top and bottom layers, and 25% honeycomb infill. You can find it on thingiverse here: http://www.thingiverse.com/thing:44588