Bowden tube Shelf clamp

thingiverse

This is a clamp for "Reverse Bowden" setups. It is specifically designed for a "filament roll above the printer" scenario. Since it is sized for my shelf, you might want to edit the provided .f3d to match your shelf. I haven't tested how strong the print actually is, but I doubt it would handle overtightening of the screw well, a quarter turn after the screw starts to bite down on the shelf is more than enough.