Easy 3D printable clamp in two pieces.
Two types of holding surfaces : smooth or with serrations Requires a M6 screw with hexagonal head and two M6 nuts :
Printing instructions : print the two pieces together or separatly, no need for supports if printed as shown in the preview
Building instructions : - put the screw through the wheel - secure it tightly with a nut - put the other nut in the slot in the body and screw everything together
Enjoy !