When testing, one of my PTFE tubes popped out. When inspecting, I noticed that the metal coupler looks broken and or misplaced and I can't even fit filament through let alone get the PTFE tube back in. Any suggestions? Other than this minor problem it is working great, really cool product!
Thanks!
Glad to see these printables. Just getting back to setting my MK3 up again and my ferrules have gone feral. 😁
I might add, you might be able to just simply remove that brass ferrule and recrimp it back on. Just make sure you support the inside of the PTFE tube if you try... I normally insert a 2mm drill bit, and crimp it on, then use the drill bit to remove any extra PTFE on the inside to make sure it's still a 2mm inner diameter. Bill
The PTFE tubes are held in with 4mm Compression Fittings. However, we've found that this might be enough on some recent tubes for some reason. If you want to use them, they can easily be purchased on Amazon here: https://www.amazon.com/Metalwork-Compression-Fitting-Straight-Connector/dp/B07CX9PD4K This includes the compression fitting and the brass ferrule. You can buy just one fitting and as many brass ferrules as you need. (They're are two included in the kit, but also you can buy them separately here: https://www.amazon.com/outstanding-Compression-Ferrule-Sleeve-Fittings/dp/B08X6NMBN9 )
However, to completely eliminate this as an issue, I've designed a replacement set of B/C parts that allow the PTFE to be held in place without the need for those fittings. It utilizes "slots" cut into the PTFE tube that seat into teeth within the B/C parts. You can see it here: https://www.printables.com/model/354998-3dchameleon-bc-replacement-parts-with-ptfe-grip
To use it, simply download the model, print and use the included cutting template to use a razor to cut the slots into the PTFE tube. Trim to length and clamp them in place with the B/C parts. This actually is a very strong grip on the tubes, and allows for easy replacement in the future.
Bill