If you haven’t purchased this accessory for your heater block / nozzle, it’s a must-have. Aleph Objects should include a sock as a standard part of the printer. Here’s a picture:
This ultra-inexpensive (~U$4.60 for three) does two extremely wonderful and valuable things for your printer: Keeps the heater block and nozzle clean – nothing stick to the silicone sock – and stabilizes temperature quite effectively. No more 10-20deg drops when the fan kicks in after the initial layer, which is a big problem at high temperatures (like 270-280 for Colorfabb_XT for example).