Superb model here! I printed mine out of Algix algae based PLA. It has very unique visual texture and color making my tower look like it was covered in moss or made of old stones or something. It also has very fine wispy strings due to my high fan setting which only added to the spiderweb and mossy look and feel. 26 hours print time total for the whole thing. I stitched the three tower pieces together to print as one, which took 18 hours. Then each staircase was 4 hours. The mess you see in the third picture was my first go at the tower and I had an issue with the cooling fan shroud which caught on the print somewhere in the middle of the night.
I'll likely do a bit of dry brushing to add highlights and details.