This was the first design I made on request, to get to know the basics of 123dDesign.
If you love hoods and caps, then this one will be useful to you.
It took me 6 months and a complete remake of the first (uglier) model to get it where I wanted it to be.
But the reward of contentment is than very nice.
slicer: Cura on finest mesh
material: PLA 1.75 mm
bottom/top thickness: 1.2 mm (because of round curves below and on top)
printing temp.: 210 C
After two prints I still had good results without the use of support material.