Print it with three wall loops and atleast 50% infill. I used PLA.
Slide the friction part into the inside of the bearing and gentle hamering will drive the bearing into the mounting plate.
The author remixed this model.
I have designed a new mounting plate for the BBT Smart Filament Senor 2.
You will need the 2 other parts from https://www.printables.com/model/384065 design. The bolts with the filament sensor will fit the mounting plate.
AMENDED ~ I found that the original printer mount was not suitable for the size and weinght of the Smart Sensor. I have increaed the size of the mounting. Print it with 3 walls and at least 20% infill. It is now a good tight push fit into the Friction Pin.