Triangle Lab Filament Sensor Groove Mount

I have an Ender3 with a BMG clone mounted in the stock location (ie still bowden based).

I needed an easy way to mount the triangle labs filament sensor and using the groove mount was an easy solution.

The sensor I used was this one from AliExpress:
http://s.click.aliexpress.com/e/bGNRiHfw

A short piece of bowden tube is needed between the sensor and the groove mount to maintain a nice smooth path into the extruder. I suggest cutting it so it protrudes out of the groove mount by about 1mm.