E3D-V6 30mm clip-on fan shroud

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I use a highly efficient fan shroud with heat-sink that works better than the original UM+ 50mm fan shroud with a small 30mm fan available from E3D. I've opted for the 24V fan version, but adjust power using Cura or Ulticontroller (the 19V fan provided with Ultimaker has a speed range of 0-250, while the 24V fan from E3D has a limited speed range of 0-25, which is a maximum velocity). There's absolutely no back-draft due to thermal expansion and the air is kept cool as it propagates through the copperfill shroud. The blown air cools the heater block significantly when near the build plate, so some kind of thermal resistance on it is advisable. The geometry focuses air inwards from all sides, therefore cooling symmetrically. Heat-sink fins are included to reduce the heat of the shroud and prevent heat distortion. The model is asymmetrical, and wires from the heater cartridge should be placed on the opposite side from the fan for the hotend to fit in the middle. I haven't tested the clip (use the rai head mount where I can screw the shroud in) but it should work fine. Print slowly at 0.1mm layer height and clean up the finished model. For UM+ Pla settings, use blue painters tape and a bed temperature of 50C if needed. The fan should be set to full speed at a height of 2mm, with a minimum setting of 15 (out of 250 for 24V fans or 8%) and a maximum of 25 (10%). The minimum layer time is 5 seconds.