Pipe clamped hook

Clamp need a M5 nut and screw, there's enough room for a Philips Head m5 screw or a socket head or something.

This should world with pretty much any material, i used PLA which can be quite stiff but the hinge can flex plenty and you'd be surprised on the amount of clamping force you can apply. 

I made the design parametric in Solidworks so if anyone needs a specific pipe diameter feel free to hit me up… on the condition that you post a make ;)