I had a need for several sets of bar clamps with about 6 -6 inches capacity. The only ones I saw were too heavy or expensive so I designed a set with a few extra features and made a handful via one of my 3D printers.

I have the STL files on my site for FREE downloads as well as two YouTube videos, one an intro and the other a how to build. Here are the links:
Intro: http://lewsmodelboats.org/Mini-Bar-Clamp.htm
Make:
Downloads:

I hope they are of use to others.

Lew