When the clamp of the Black & Decker Workmate breaks it is easily replaced with this model. I've used it for some time now and it works fine. It's probably not a good idea to print it with regular PLA. I've used Polymax PLA which is very strong but still has the printing benefits of regular PLA such as low temperature printing (190 degrees Celcius) and good adhesion to the print plate.

I've also include the source file (.slvs) for Solvespace (v3.0). This allows you to make changes to the design. Solvespace is a free and open source, easy to use 3D CAD program that works on Linux, OSX and Windows.

Solvespace can be downloaded here: https://solvespace.com/download.pl or from the repository from your favorite Linux distro.