This is a screw together coupler for a Bowden Tube, to allow it to be opened at some midpoint. It is a work in progress right now but 90% there. Once this is done, I may integrate a runnout sensor into it.
Update 2/8/2022 - I wrapped up the design on this today and it's gonna get posted later this week. It uses a TPU insert to help seal the connection between the Bowden Tubes. I don't know how "sealed" it is but I thought "why not" since I have the TPU. I will also post a version that does not require the insert though.
Update 2/11/2022: This is now posted on Prusa here:
Welcome to my Stoopid corner of teh Internet. It's mostly gonna be 3D printing stuff, but I also post some recipes, projects, and the occasional rant here as well. More Stoopid stuff is updated regularly.