This is a nozzle cleaning brush mount. It is designed to fit on a 3mm thick bed subplate. It's used with Marlin G12 code. I put G12 P1 S2 T3 in my start script after G29

Here is the brush I used.
https://www.amazon.com/AllwayTools-GB-Stripping-Grout-Brush/dp/B000KKRG9I

These are my configuration.h settings

define NOZZLE_CLEAN_FEATURE

if ENABLED(NOZZLE_CLEAN_FEATURE)

// Default number of pattern repetitions

define NOZZLE_CLEAN_STROKES 5 //was 12

// Default number of triangles

define NOZZLE_CLEAN_TRIANGLES 3

// Specify positions as { X, Y, Z }

define NOZZLE_CLEAN_START_POINT { 225, 20, (Z_MIN_POS + 1.5)}

define NOZZLE_CLEAN_END_POINT {240, 75, (Z_MIN_POS + 1.5)}

AM8

No

Yes

.20

50-75