Gold PLA from bamtack. Had to slow my printer down by to 2880 mm/s with an extruder temp of 215. The final print was 100% fill with 4 shells. Still had some fill problems, but overall happy with the result. For the hourglass, i used transparent PLA from Meltink. I had a nice solid piece using the standard settings in Simplify 3d. I achieved the more transparent, but less "clean" version by using "vase mode." Overall happy with the result. It's a gift, so I didn't have much time to tweak.