HMG7 Phaetus Dragonfly BMS - Bowden Adapter
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Adapter to bypass the annoying bowden collet on a Phaetus Dragonfly and use a PC4M10 instead.
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TLDR - HeroMe Gen 7 and Phaetus Dragonfly BMS are great until you need to get to the bowden tube and fight with that little clip. This bypasses that, constantly holds it in the release position, and secures the tube with a PC4M10 coupler. Other than longer screws, no modification needed for the hot-end mount.
I love the HeroMe Gen 7 system. It was the first major upgrade for my Ender 3 v2 Neo. I chose to continue with bowden, and have found accessing that collet to be the most frustrating thing - I can either remove the heater and PT1000 to slide the hotend out, or fight with small spaces, remove a fan, and risk breaking wires to access the collet clip. I finally got tired of it after I had a serious clog that required yet another tear down. After it was back together, I started designing this to avoid that situation as much as possible.
You will need one PC4M10 coupler and two M3x16 screws of your choice. If you print the heatsink optional test part, you will also need one of those bowden collets like the top of the actual hotend. The collet should press in and work as normal.
Print with at least 3 walls, top, bottom, and 15% or more. I was able to print with no supports, but you shouldn't need them.
Start by removing the two M3x8 screws holding the hotend mount to the HMG7 base. Then, whatever method you normally use to remove the bowden tube, do that. I have my dumb ways, there's probably a better way, whatever :)
I would suggest trimming the bowden tube a bit to ensure it is smooth, or better yet now is as good a time to replace it as any other.
Attach the PC4M10 to the top of the new adapter - it should thread in nicely. My machine isn't the best for tolerances and even I got it to work…took 14 versions but that's beside the point.
Test fit the adapter to the hotend mount and ensure that it is pressing the collet all the way down. I tested this 8-10 times with various lengths to ensure a snug fit.
Feed the bowden tube through the top of the enough to get started, then place it on top of the hotend mount with the hotend installed normally. The tube should pass all the way through into the hotend as normal. Ensure that the tube extracts as expected when you compress the PC4 adapter - it should slide right out.
Finally, mount everything with the M3x16 screws and enjoy.