This pipe clamps can be used to fix a tarp on a rod to prevent to be blown away by the wind. Because there are different needs for the dimensions of such a clip I made my previous FreeCAD-project again with OpenSCAD to make it customizable.

Edit 2020/07/05: In V2 chamfers for the endpieces like in FreeCAD added for more stability by Pascal. Don't worry if the preview in thingiverses customizer looks a bit weird. The finally generated stl-file will be OK.