Blower Nozzle

thingiverse

So I've been meaning to make a nozzle for a while but all the ones I could find seemed too bulky for my kossel. So obviously I made one myself that is designed to be used with the 4010s fan which I picked up off ebay for £2.99. This fan is 40mm x 40mm x 10mm and blows air out the side which I then simply funnel towards the tip of my extruder. The fan press fits and screws (extra stability) into the part which is then screwed into the lower holes of the existing fan on the extruder. There is no need to dismantle the hot end or re calibrate. It just bolts on and works. The nozzle drops from about a 8 x 28mm slot to roughly a 2.5 x 14mm slot. The amount of air coming out seems to be more than adequate so far. It is designed to get the most out of the little fan by not disturbing the direction of flow too much. A lot of designs seem to have complicated airflow passages which I can only imagine reduces their efficiency. Simple is best I think. The main factor driving cooling is the velocity of the airflow as this reduces the thin layer of static air on on the surface. This thin layer cools via conduction which is far less efficient and therefore should be minimized. Thus is think it is important to keep the flow in one direction and is why I opted against a omnidirectional nozzle. The part can be printed in one go with no supports and took 40mins on my kossel xl. The walls are a little thin so ironically you'll want a fan cooling it as it prints. The design could maybe do with a little tweaking but as I only need one and it's working fine I haven't bothered. Parts: 4010s blower fan https://www.ebay.co.uk/i/263060501410?ul_noapp=true M2 x 8mm screws M3 x 16mm screws (could go a bit longer) If anyone has any suggestions let me know and I'll upgrade it. I was thinking about putting slots in so the height can be adjusted as I don't know how universal the hotend length is (mine was about 14.6mm from the underside of the fan to the underside of the aluminium).