I have pretty much stopped roasting the dirty hemp / cotton fiber after I discovered an easy way to reclaim the oil and that I have an amazing new device for vaporizing the oil. E-Cig Cartridge Mod Have been letting the filter get very oily before changing it. The dirtier it gets, the more it seems to filter. I think of it like strands of fly paper and the large particles are the flies. After heating the glass (by drawing hot air through it) to loosen the oil, I push the dirty filter into a silicone sleeve. A few drops of everclear are added to get the filter soaking wet. I then squeeze the silicone sleeve over a shot glass to catch the oil / alcohol mixture. I repeat until the alcohol is clean when I squeeze out the filter. The silicone keeps your fingers from touching the mixture so there is no mess. Place the shot glass in a warm spot to evaporate the alcohol. I am experimenting with having a filter that I only use with the HILite to see if there is a difference in the oil from the lower temperature. I will use a different filter to finish roasting the tube at higher temperatures. The silicone sleeve of the Turbo Tube can just be switched to different mouthpiece tubes that contain the filters.