What an interesting idea! With Simplify3D it would be easy to set up a couple of different processes to get this effect at precisely controlled heights.
That’s what I thought at first - but the temperature was stable at 260 all the time. It is probably the time the filament stayed at that temperature that made the difference.
@Jon_Stern correct. You can also do this with slic3r, or you could add M220 commands at specific intervals manually. I came to know about this by accident - so this was manual - also since I did not have my camera online, the effect was guesswork and basically when I remembered to send the command from office.
@Dushyant_Ahuja well yes the hotend temp stayed the same. But look. It takes a while for the filament to get to that temperature. So printing faster results in a little less temperature! @Rene_Jurack was quite right. Maybe you are just a the point it get transparent/milki. Try +5 deg and test again. Or print slower overall. Also the thicker layers bring better seethrougj
Same goes for PLA, if you print it fast enough, it appears to be matte vs glossy. Slower prints do make for stronger parts though with much better adhesion. I’ve found that even if i’m printing PLA with my nozzle at 235c and printing 100mm/s, it won’t be on the same level of glossy as 25-30mm/s at 210.