Bottle Cap Insert for Knurled Shaft

Another print based around a **Source Perrier** bottle's cap using **Tough Ink** from **M3D**. Although this fits rather snugly against the ridges of the inside of the cap, a little glue won't hurt it. Alternatively, it may just be best to print fairly dense. I went with thick, hollow walls for demonstration purposes and speed, but I would imagine you'd get a much tighter fit if you went for even medium infill. Solid might require a bit of force.