I have created this model thinking that a seashell can be as well a good lampshade for a bedside lamp.

Instead of PLA I've used a PVB filament because it's easier to postprocess.
 

Just spray with isopropyl alcohol and let it dry.

That is enough to hide the print lines and get that shiny finish it has.

Infill 10% (lightning recommended)

Nozzle size 0.4mm,

Layer Height 0.2mm,

Print speed 200 ms,

NO supports needed.Raft recommended.

Wall count 2

After printed and postprocessed, I glued it to the lightsource which I bougt in Aliexpress:
https://es.aliexpress.com/item/1005003775560471.html?spm=a2g0o.productlist.main.25.2146yLmIyLmI54&algo_pvid=f8d079fc-ebd2-407d-b113-4d771d599546&algo_exp_id=f8d079fc-ebd2-407d-b113-4d771d599546-12&pdp_npi=4%40dis%21EUR%2112.24%217.35%21%21%2112.73%217.64%21%4021038e1e17314432241022591e35df%2112000027123372282%21sea%21ES%211703370847%21X&curPageLogUid=k2TY0tiwBoFM&utparam-url=scene%3Asearch%7Cquery_from%3A