I’ve been trying to print some things in TPU, using a fairly soft 85A TPU, and I keep having under extrusion.
I’ve already reduced speeds to max 25mm/s, and reduced retraction. My printer uses a direct drive extruder, and as far as I can tell, it’s grabbing the filament just fine. I’m printing at 240°C, using my default 0.4mm volcano CHT brass nozzle.
I always kinda hated printing with TPU, it was am absolute nightmare on my old printrbot.
It’s much less so on my prusa, but I’m still used to avoiding it whenever I can.