Hmm, ok, there was something unusual in the slicer settings. 10 wall layers and 6 top/bottom, and fwiw, 75% gyroid fill. This may be overkillm, but the part prints like a rock. It will be used as a harpoon, so needs to have weight and good impact resistance.
Glad to hear it worked for you. I'll try it again when I get a chance, maybe play with the layers and fill.
Thanks for looking into it!