A nice swirly pentagon-based vase/pot/penholder I designed.

my print settings printing in clear PETG on an Ender3 V3 SE:
 

*Vase Mode / “Spiralize Outer Contour”
*1 wall, 1.6mm thickness
*230C nozzle temp
*85C bed temp
*60mm/s print speed, 15mm/s initial layer speed
*Cooling Fan OFF