Kobra 3 Combo | 9 Position Bowden Tube Hub UPDATED V2
Description
## 9-in-1 Kobra 3 Multicolor Hub v1 I made this because the hub linked by Anycubic in its recent 8-color announcement email was a bit crap, didn't function like the original, and everyone else seems to have forgotten about the 9th bowden tube for the freestanding roll option. You know, the one that you'll need to use if you want to print flexible filaments. This part should allow you to leave all of the bowden tubes hooked up all of the time, which means you'll only have to shut the printer off and unplug the ACE Pro to switch to "normal" printing with a single spool. The "Slim" files are sized for the parts harvested from the hubs that comes with the Kobra 3 or parts of the same size. The "Large" files are a larger version that is sized to work with the parts I was able to find cheaply on Amazon with Prime shipping. The collets have a larger top diameter and the springs are a bit longer. I also edited the design of the top piece so that it will clip in more securely and more repeatedly without the need for an additional retainer cap. The "Medium" files are a trimmed down version of the "Large" version, making the hub a little smaller. It is still designed to be used with the aftermarket parts: the larger diameter bowden tube collets and the slightly longer springs. ### Additional Parts Required 1. *Springs:* You can cannibalize a few stock hubs and get the springs that way. They're 12mm long by 7mm OD by 0.4mm wire diameter. I ordered some 15mmx7mmx0.4mm springs from Amazon. I haven't found a source for the 12mm long ones. [Affiliate link](https://amzn.to/3NfVjQA) 2. *Bowden Tube Clamp/Collet and Clip:* Again, tear down some other equipment for parts, or you can buy these: [Original Size @ AliExpress](https://www.aliexpress.us/item/3256807454831680.html) [Larger Size @ Amazon Affiliate link](https://amzn.to/3Y9ukg2). ### Other Notes As I use this, I may make some additional changes to improve usability or performance. PLA should be fine as a material, but PETG seems a little slicker. If you're worried about friction, maybe try that. Give me some feedback! This part was designed with Fusion360 after measuring the original hub with a cheap set of digital calipers.
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