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.

  • InEnduringGrowStrong@sh.itjust.works@sh.itjust.worksEnglish
    0·
    9 months ago

    It’s been a while since I last printed TPU.
    I think I’ve always had to set a slightly higher flow rate for TPU, probably because it always compresses a bit when pushed by the extruder.
    My TPU roll printed somewhat colder than yours at about 220C.
    I usually start with a very low speed (15-30mm/s), retraction completely off, cooling fan very low (25%).
    Tune the flow rate and speed then add a tiny amount of retraction (<1mm).

    YMMV