Ender 3 CR-10 Hotend 2510 25mm snap-on cooling fan duct

thingiverse

Designed to work with the stock Ender 3/CR-10 hot-end heatsink, mimicking the regularly used ducts seen on round heatsink hot-ends. Benefit: (See Attached Image Graph) -Heater Block Performance -Weight Reduction The stock 4010 hot-end cooling fan ALSO blows on the heater block, causing the system to fight being continually cooled. This will allow for faster warmup times and more stable temperature control at higher temperatures. For users upgrading the part-cooling fans, this allows for a lightweight solution than the very large 'cages' that go around the hotend to hold a 4010 fan. Example image shown using the KLEMCO groove mount adapter and ducts that can be found here (note: I made my own Orbiter v2.0 adapter and BL Touch bracket seen in this example): https://www.thingiverse.com/thing:4117436 Fitment: The top has clearances for most common hot-end mounting bolt head sizes. The duct can be pressed onto an assembled hot-end heatsink from the front (without removing the hot-end from the gantry mount) as the curved sides of the duct should snap around the heatsink. I have included two protruding channels on the inside of the duct (see image), which slide within the bottom fin of the heatsink to prevent the duct from sliding up or down. Verified Cooling Capability: I warmed the heater block to 260°c for 1 hour without any filament flowing and let cool to room temperature (performed 3 consecutive times) to ensure there wasn't any "heat-creep" that would cause clogs from poor heatsink cooling. Skill Disclaimer: I used Tinkercad and poor CAD skills to design this so I encourage much better remixes! Filament Recommendation: I used a FLIR camera to measure radiant heat from the heater block and its exposed to about 70°c when I heated the block to 260°c, which makes PETG the minimum preferred choice (although ABS is about 15% lighter for you lightweight speed-printing enthusiasts out there). PLA will work 'decently' (most of my testing was with a PLA dev part) but it will begin to lose its snap-on tension over time as the plastic softens from radiant heat exposure, compared to PETG or ABS. Fan Recommendation: Any 25x10mm fan should work but here’s the specific fan I used: WINSINN 25mm Fan 12V, 3D Printer Micro 12 Volt Fans 2510 Dual Ball Bearing, Brushless Cooling 25mmx10mm 2PIN (Pack of 2Pcs) https://a.co/d/0YWYZIz Print Orientation: Print upside down as shown in the attached images. Do not print with the mounting face for the fan laying downward. This will make the snap-on part less strong from the print layer orientation. I recommend using a raft since there is very little contact area with the bed surface. It just ensures it stays attached on your very first print attempt.