This is a mount for a PTFE tube and PC4-M10 connector, designed to hook into a SKADIS pegboard. The inbuilt thread goes all the way through the hole, so the connector can be mounted facing up or facing down
This was initially built for use with my A1 mini, as the spool holder that comes with the A1 forced me to have the printer sitting further forward than I liked, and this fit my workspace better.
The author marked this model as their own original creation.