BigTreeTech BTT Smart Filament Sensor Mount for Ender 3 Pro

A simple mount for the BigTreeTech Smart Filament Sensor for the Ender 3 Pro.

Slots onto the metal bracket behind the v-slot roller for the z-axis.

This replaces the backplate of the sensor. It can be removed by removing the 6 screws on the back. These screws can directly be reused to mount this bracket (using only 5 screws as the roller-screw on my Ender 3 Pro protruded out far enough to interfere with the final screw).

I simply use a short piece of PTFE tube on one side (short enough to end before the z-axis lead screw) and a longer piece on the other side to act a bit as a filament guide.

There are two versions one facing down (as in the image) and one flipped upwards. I use the downward one as it looks a bit cleaner, but I had originally designed it flipped so I uploaded that older version as well in case anyone wants it.

The idea behind the mount is based on the filament guide by Holspeed: https://www.thingiverse.com/thing:3052488

I uploaded the STEP file as well, if you want to adapt it in any way (it works well enough for my usecase that I don't plan on iterating on it any further.)

Printing Notes:

I used PLA and printed it upright with a raft and a fair amount of support as seen in the image above. I did this to ensure the shape of the opening where it slots on was perfect. (You could probably also print it lying down without the raft and support and just do some post-processing, but I never tested it).