[Mgx3d] has done that by designing 3D printable bar clamp jaws with a quick release mechanism that can be used with standard T-slot aluminum extrusion. This allows you to create ad-hoc bar clamps ...

Each mechanism was simulated as being printed using one of three common printing ... the 3D-printed parts to accommodate the bolt. The first mechanism was a T-shaped clamp, where the T-bar rests ...