inspired by sphynx's button cell holder (http://www.thingiverse.com/thing:34791) I made a clone ;)
modeled a tiny lamp shade for it.
printed the shade with this configuration (k8200, nozzle diameter: 0.5mm):
layer height: 0.25
perimeter min: 3
top layers: 0
bottom layers: 4
use with a CR2032 cell an a 5mm LED and voila: you have a table tea light