This is a modified Version of Spirit Fan Mount which can be found here https://www.youmagine.com/designs/ultimaker-2-fan-mount--2#!design-information I have been playing with Spirit fan mount and modifying it to to work with Anders heater block. I like this design because it is enclosed and stops any temperature errors caused by open bottom designs. I have lowered the whole thing by 8mm, this means the bottom of anders heater block is 4mm - 4.5mm away from the fan shroud enclosure, this means i did not have to use any tape as per sprint original design. I have used ABS for the shroud for the last 2 weeks and had no deformation at all (see red shroud above) and currently running a XT-CF20 shroud with no issues at all. both been run with 250 degrees temperature. Have not tried PLA for the shroud.I have also opened up the nozzle hole to take the socket that is supplied with Anders nozzle for easy changing of nozzles.Another link to Sprint original design https://0x7d.com/2014/12/improved-ultimaker-2-fan-mount/