This mounts to the TUSH bracket I created for my AMBP, aka, Black Printers Matter.

It puts the sensor well away from the extruder and close to the spool, giving plenty of notice of filament runout.

This is usable for literally any printer that has 2020/40 aluminum extrusion for a top cross rail.

You will need:

an end stop switch:

https://www.amazon.com/gp/product/B073TYWX86/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

3ea M3x6mm self-tapping screws

Appropriate connectors: I used 2.5mm JST's

My AMBP

No

No

Fine, .15 in Cura

15%

Use CA to glue the FRO Pin into the recess in the back of the FRO Sensor Base.

The FRO Mount screws to the TUSH bracket using 2ea M3x6mm self-tapping screws.

THE FRO PIN on the back of the FRO Sensor Base fits into the FRO Mount and is retained by the FRO Cap and an M3x6mm self-tapping screw.

The switch wiring fits through the holes in the TUSH bracket to allow it to ride in the top cross frame rail, under the Top Left Corner Cover, and down the backside Gantry rail. It is shortened with JST connectors for easy repair if/when necessary.

The metal switch actuator will need a slight bend outward and then back inward at the end.

I created covers for the top rail, top left corner, and backside gantry to hide/guide the wiring.

The TUSH Bracket can be positioned so the wiring exits from either side into the Top Cross rail.