CR-7 CR-8 Fan Duct

thingiverse

First of all, I would like to thank David Liao and Chu for their contributions in providing the base file for modifying the wind shield. I have tried out several designs, but this one is the closest to my ideal so far. Here are its advantages: Firstly, it is a redesign of the shape. The angled design is certainly more stylish than the original. The airflow is also sufficient. The wind shield is not too low, so it won't hit the long tail clamp when printing the first layer. There are many locking points, which means they won't interfere with each other and will be stable. Only one fan is needed, which eliminates the need to pull multiple wires and add weight. As an added bonus, the design can accommodate a 404020 large fan without any issues. The only disadvantage is that it's a bit of a challenge to install the laser head on the CR-8. I initially wanted to add a laser engraving module connector, but it turned out to be impractical. Instead, I focused on improving the design. Here are the improvements: Firstly, an additional circular plate has been added. Its benefits are two-fold: firstly, the fan won't accidentally push too far back and get stuck; secondly, it reduces side airflow and improves concentration of air flow. Additional locking points have also been added. If you're still feeling anxious about the fan's stability, you can lock it in place. However, if you want to make things easier for future replacements or if you lose the screws, you can choose not to lock it. The locking points have been thinned down. Originally, they were quite thick and theoretically strong, but unfortunately, this made them incompatible with the original screws (they're too short). By making them thinner, we can now use the standard M3*18 screws, which are still strong enough while also being easier to remove. Another bonus is that they won't fall off as easily when loosened. To avoid interference, I've added an opening for the long screw driver. This makes it much easier to lock or unlock the fan without having to deal with the triangular fixation point's screws getting in the way. The original support was a bit off-center (pic), and some parts were still floating. When printing failed, there would be ugly remnants (pic). I've since corrected this. There was an additional blockage near the heat sink that was either a mistake by the original author or intended as a support. However, it's actually not necessary to use a support here; we can simply bridge over the gap. By the way, even though adding a vertical ring might seem counterintuitive, it does provide added stability while still maintaining the original model's benefits: no need for supports, and you can print directly without worrying about brim or rafting. Of course, I've also included a separate file that separates the support from the main body. This is useful for those who want to push their printer to its limits or modify it to suit their needs. Throughout the design process, I used Onshape's free online tool, which is perfect for both beginners and experts alike. I hope this updated design meets your expectations! If you notice any omissions, please let me know so I can add them. New additions include Chu's single-direction fan design. Initially, I discarded it because of the low airflow that could hit the long tail clamp. However, some users expressed interest in having a laser engraving module, so... This design can now be paired with Yellow Seng Sun's Laser Module Fixing Board V2 (http://www.thingiverse.com/thing:1889421). Additionally, I've included an updated version of the design without fixed ears. Some users asked for this, but to be honest, I find it puzzling – the ears are quite nice! Nevertheless, I've removed them as per request. This updated design is now available for download.