I have only printed this so far in ABS, but I think any of the others than can take more handle up to 75deg c will work like nulon or one of the flex filaments would also work in making this candle mould. What I do was to spray the inside of the mould with an high temperature black paint as they use on braai’s (barbeque) to help make the surface smooth and sealed for the wax or you get a very rough finish. ABS at 245 deg c with build plate at 60 deg c infill of 15 % and layer height of 0.2mm