Creality Ender 3 S1 Sprite/Pro Extruder Part Cooling Fan Duct

prusaprinters

<p>Disclaimer: Due to duct tips having close vicinity to the nozzle, use at your own risk of failed print depositing globs covering/melting the ducts.</p><p>Low-profile part-cooling duct for stock Creality Sprite Sprite-Pro extruder 40x40 part cooling fan. Original duct is simple, low-restriction and hence high volume/efficiency. However, also because of its simplicity, it doesn't aim flow near the nozzle, let alone the backside of it. It's especially bad for PETG where you don't want draft on printed layers or they'll curl, which can be prevented with stock duct by reducing fan percentage but on the flip side won't give enough cooling on the freshly laid out part.</p><p>My goal in designing this duct is to aim at the shortcomings of the stock duct while maintaining (and even increase) clearance to printed part, minimizing added visibility obstruction to the nozzle and printing progress, all the while focusing airflow towards the nozzle from slightly above and around. This is WIP (work-in-progress) as I always want to direct more airflow to the back but in fear of reducing efficiency and overall flow. I might eventually upgrade to 5015 blower which I already have in hand, but I don't want the extra weight and I want to see how far I can push the stock blower.</p><p>I use this overhang challenge (https://fullcontrol.xyz/#/models/b70938) to stress-test cooling efficiency and direction all around print (see picture of purple tower printed with PLA with 95 degrees of overhang). So far results seem to suggest not any less overall cooling than stock duct but more even around the print. In addition, I don't need to turn down part cooling for PETG in fear of curling because this duct directs air away from where it might curl to where it needs most cooling.</p><p>Designed with DesignSpark Mechanical v5. Please print with opening-end facing bed (like most fan ducts should). No support required. Comments welcome for suggestion as this is WIP.</p><p>&nbsp;</p><p>2022-10-26: Uploaded version 2.0. Side ducts don't reach in to nozzle as close to avoid being melted according some reported. Front duct reaches in further for better front cooling. Side duct arms span farther apart to enhance viewing of the nozzle in operation from the side.</p>