cr6-se btt eddy conversion

this mod completly removes the strain gauge, and switches it in favor of the btt eddy, which together with eddy ng(or the beta feature of normal eddy firmware) acts both as a Z endstop, probe, and sets Z offset automatically. This mod also increases the hotend rigidity immensly and allows for safe direct drive conversion of the cr6-se.

plate is compatible with any ender 3 compatible hotend, in my case i use a Revo CR hotend for easy nozzle changes and easy mounting, together with a sherpa zero(sherpa mini mod) to achieve fast prints with great quality

i use eddy ng for my klipper install, you can use normal eddy firmware if you want.

BOM:

4  M3x4.2x5 heat set inserts(2 for the pcb holder and 2 for the backplate, they fit into the 3.9mm holes)

2  M3X25mm bolts

2  M3 lock nuts

2 M3 washers

Ender 3 compatible hotend

dragonfly partcooling part from 6burner toolhead page(exact size for ender 3 length hotend)

Eddy Duo/Usb(plugs directly into the pi running klipper, original motherboard doesnt support it)

installation(assumes youre upgrading from a normal 6burner and already have all the parts of it printed and assembled, if you arent upgrading and printing from new and would like help choosing parts message me):

remove the board base part from the original toolhead and remove the pcb from the original board support

dissasemble the strain gauge from carriage

install the backplate in the place of the board base and strain gauge(might need to expand the holes to fit the carriage threads)

install BTT Eddy and hotend on backplate

plug cable into btt eddy and compile the firmware for it before installing the pcb holder as it will be hard to reach the plug and boot button afterwards

install pcb holder

congrats, you now have a good bed leveling and z offset probe

be sure to either comment out, or completly remove everything mentioning a z probe in the printer.cfg prior to the new probe configuration, even saved configs from the bottom of the page

eddy ng installation instructions: https://github.com/vvuk/eddy-ng?tab=readme-ov-file

the offsets for the probe are measured in cad, they are:

x_offset: -42.345

y_offset: 5.312

bed_mesh config also needs to change, the values i give are with the nozzle wiper i made for the cr6(yes its fine that it hits it a bit every time, if youd like it to not do that change the 185 in mesh max to 170 but do beware the mesh will be quite a bit away from the right edge of the bed)

mesh_min: 13,13
mesh_max: 185,220 
scan_overshoot: 8
horizontal_move_z: 3

i also increased the bed mesh speed to 200mm/s 

print settings for backplate: petg or better (settings are like this because it needs to be rigid not to flex the eddy when going at high speeds)

30% infill

3 fill multiline

5 wall loops

5 top and bottom layers

if you have any questions about anything regarding this project do not hesitate to message me(ill turn my notifications on this time) and ill do my best to help

cad is available via request(its mixed fusion360 and solidworks so good luck, i can provide obj files aswell)