[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 ...

Quick-release clamps usually aren't as long as bar clamps ... You wrap the strap around the object you're fastening, feed the free end through the ratchet and pump the ratchet to tighten the ...