Model was edited in Blender. Can be printed in vase mode with no problems with gaps.
Picture shows 150mm tall gnome. Printed on modded Ender 3, 0.6 nozzle, 0.65 line width, 0.15 layer height. Printed in 2 hrs, Spectrum PLA Rust Copper.
If you see any gaps, try to lower your speeds or try to make line width bigger, even if You have only 0.4 nozzle, You can print 0.6 or 0.8 line width ;)
The bigger the scale is, the bigger line width need to be to avoid gaps (or lower layer height).
IMPORTANT:
Set limit of layer print time to 2-5s (depending of your cooling system and printing speed), otherwise tip of the hat will be melted and twisted.