Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:3964678.
I mount my spools on the wall now and wanted a way to also mount the end of my PTFE tubes. Since the direction that the PTFE should draw from the spool changes depending on how full the spool is, I wanted something that would change pitch as required.
This prints easily and then attaches nicely. The angle of the holder's opening nicely locks in the pivoting M10 coupler for ordinary use (and gravity) but is also easy to take out by rotating the coupler to a more extreme angle. This helps me feed a new filament spool in easy, or simply detach the spool from the wall while it is still threaded.
I'm using this pack of 10 PTFE M10 couplers from Amazon (US). My personal application is to complement the use of the must-have Prusa MMU2 PTFE Holder M10 Passthrough Adapter mod (Thanks! vertigo235) for the Prusa Multi-Material Upgrade (MMU). The above Amazon link provides 10 couplers, but the above-linked mod only requires 5. This will use one of the left-overs, or all 5 remaining if doing 5 filament feed tubes.
Note that the thread I am using in this print is metric 10mm diameter and 1.0mm thread pitch (ISO Metric designation M10x1) and while the M10 couplers from the above Amazon link fit nicely, there is reason to believe that the actual couplers are using some non-metric thread pitch instead (See comments here). Regardless, I can report that the couplers fit very nicely and firmly in this print.
Update: The coupler now prevents the PTFE tubing from "moving" up when pulled.
Also, the Fusion 360 files are here: https://a360.co/2swDaIt