I'm using amolen tpu on an ender 3 v2 with upgraded bowden tube and metal extruder. https://a.co/d/h0QhSBP I've dialed in a few parameters and have the joints working. Now, I'm trying a print at 50% extrusion speed as a last ditch effort and will post pics tomorrow. Ultimately, I think the dragon's mouth needs to be shaped more like a C than a U for the it hold with TPU (edited)