There are multiple ways to use C-clamps, including ... among other things. A quick-release clamp, aka a speed clamp, features a trigger on the fixed jaw. When you press the trigger, the jaw ...

[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 ...