This is a Series of PTFE tube holders with PC4-M6 Threads to terminate Filament runs.
There is a chamfer on each rendition.
Very useful for MMU2 PTFE tubes.
Infill:10% - 25%
Filament: PLA/PTFE/ASA/ABS
I used 2 Drywall screws (5/4") And mounted into a hard surface
Wood/Metal/Hard Plastic
The author hasn't provided the model origin yet.