Prusa i3 MK3s Extruder Stepper cooler

thingiverse

15.08.2019 After swapping out the original heatbreak for an e3D, we were able to print materials that had previously failed to run smoothly. Version 4.2 introduces minor improvements and a more stable design at the opening. Version 4.2_Bowden is optimized for use with Thingiverse model #3425397. 29.07.2019 Update V4 I uploaded a newer version, featuring tighter fitment around the stepper motor, improved airflow, and enhanced wiring. Printing without support in ABS or PETG is now possible. If you're using ABS, print the securing bolt slowly and use minimal fan to achieve good quality. Most PLA filaments work very well (I've printed over 20 hours at 29°C ambient temperature), but I'm currently experiencing issues with one particular type of PLA. I replaced the noctua fan with an empabst fan, which provides four times the airflow. V3 Since early June, my MK3s has been experiencing problems processing certain types of PLA. The support team suggested using the engine radiator from CG-Tech. However, since this only blows air downwards, I designed a new version from scratch that directs airflow to the side. I've successfully completed some ABS and PETG prints with this design. Unfortunately, the cooling system still isn't sufficient for certain types of PLA (like JANBEX's blue). For ABS and PETG, the results are excellent. To keep the fan in place, I added guides and a latch to secure it correctly. Today, I discovered that CG-Tech has released a similar version. This could potentially conflict with the MK3s' fan design, so I'm sharing my own version here. To test the effectiveness of this design, I conducted extra trials using ABS, as warping is more pronounced and temperatures are higher. By doing so, I was able to reduce engine temperature by about 20°C. I hope to resolve the PLA issue soon, but I suspect that a different extruder design will be necessary. Note: 1) The standard MK3s extruder fan blows air through the heat sink, with some airflow escaping again. To redirect this air towards the print bed, I attached a piece of plastic (blue). This improves ABS printing results. 2) When working on high prints, avoid leading cables down the center of the wiring harness. Instead, guide them slightly laterally on the height of the slide bearing to prevent collision with the frame.