This is a remixed version of the Thule frame protector. I had no TPU at hand and decided that a thin layer of filament is enough to keep the struts together. Of course without TPU there is no soft layer that protects your bike frame againts scratches. However, this can be resolved by placing a piece of fabric, a sponge, or something similar between the bike frame and the clamp when mounting it. The actual purpose of this part is to distribute the pressure more effectively—and that can be achieved even without TPU. 

You need some cord with 3mm diameter.