Blower Nozzle

thingiverse

So I've been planning to create a nozzle for some time, but all the ones I could find seemed too bulky for my kossel. So obviously I made one myself that's designed to be used with the 4010s fan which I picked up on eBay for $3.99. 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 into the part, providing extra stability, which is then screwed into the lower holes of the existing fan on the extruder. There's no need to dismantle the hot end or recalibrate - it just bolts on and works. The nozzle drops from about an 8 x 28mm slot to roughly a 2.5 x 14mm slot. The amount of air coming out seems more than adequate so far. It's designed to get the most out of the little fan by not disturbing the direction of flow too much. Many designs seem to have complicated airflow passages that I can only imagine reduce 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 the surface. This thin layer cools via conduction, which is far less efficient and therefore should be minimized. Thus, I think it's essential to keep the flow in one direction, which is why I opted against an omnidirectional nozzle. The part can be printed in one go with no supports and took 40 minutes 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.com/i/263060501410 M2 x 8mm screws M3 x 16mm screws (could go a bit longer)