I’m printing TPU with .8 mm nozzle and having troubles with the first layer. There are gaps between the layer lines and it looks pretty bumpy.

I’m printing with .3 mm layer height and my print speeds are at 20 mm/s.

Any idea what I could do to improve the first layer?

  • GormadtEnglish
    3•1 year ago

    Looks like wet filament to me, TPU really loves moisture so storing it in a dry box is necessary.

    If you do go to dry your filament use a dehydrator (food or filament) not your oven.

    But something I’d check as well is the distance between the bed and the nozzle, just to be sure.

    • @MeltedManufacturingOPEnglish
      3•1 year ago

      I think you’re right! It’s extremely humid right now and when I print I’m hearing snaps and crackles. I’m guessing that is the moisture from the filament?

      Thanks for the help!

      • NiyaShy
        4•1 year ago

        If you can already hear it during normal printing, then yes, it’s most likely wet filament. The water trapped inside almost instantly turns into steam inside the nozzle and expands, causing the molten filament to bubble up as the steam escapes.